PATENT COLLATERAL AGREEMENT This 24th day of February, 1998, Eagle-Picher Industries, Inc., an Ohio corporation ("Assignor") with its principal place of business and mailing address at 250 East Fifth Street, Cincinnati, Ohio 45202, in consideration of ten dollars ($10.00) and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, assigns, mortgages and pledges to ABN AMRO Bank N.V., a bank organized under the laws of The Netherlands, acting as agent for the Secured Creditors under that certain Security Agreement referred to below, with its mailing address at 1325 Avenue of the Americas, New York, New York 10019, and its successors and assigns ("Assignee"), and grants to Assignee a continuing security interest in, the following property: (i) Each patent and patent application listed on Schedule A-1 hereto and all of the inventions described and claimed therein and any and all reissues, continuations, continuations-in-part or extensions thereof; and (ii) Each patent license listed on Schedule A-2 hereto and all royalties and other sums due or to become due under or in respect of each such patent license, together with the right to sue for and collect all such royalties and other sums; and (iii) All proceeds of the foregoing, including without limitation any claim by Assignor against third parties for damages by reason of past, present or future infringement of any patent listed on Schedule A-1 hereto or of any patent licensed under a patent license listed on Schedule A-2 hereto, in each case together with the right to sue for and collect said damages; in each case, to secure performance of all Obligations of Assignor as set out in that certain Security Agreement bearing even date herewith by and between Assignor and Assignee (the "Agreement"). Assignor does hereby further acknowledge and affirm that the rights and remedies of Assignee with respect to the assignment, mortgage, pledge and security interest in the patents, patent applications and patent licenses made and granted hereby are more fully set forth in the Agreement, the terms and provisions of which are incorporated by reference herein as if fully set forth herein. All terms defined in the Agreement, whether by reference or otherwise, when used herein, shall have their respective meanings set forth therein, unless the context requires otherwise. IN WITNESS WHEREOF, Assignor has caused this Agreement to be duly executed as of the date and year last above written. EAGLE-PICHER INDUSTRIES, INC. (CORPORATE SEAL) By /s/ ANDRIES RUIJSSENAARS ____________________________ Its President ________________________ ATTEST: Andries Ruijssenaars ---------------------------- (Type or Print Name) /s/ JAMES A. RALSTON - ------------------------------- Its Secretary ABN AMRO BANK N.V., as agent /s/ JAMES A. RALSTON - ------------------------------- By /s/ GEORGE D. AMOROSO /s/ PAUL WIDUCH (Type or Print Name) _______________________________________ Its Group Vice President GVP ----------------------------------- GEORGE D. AMOROSO PAUL WIDUCH _______________________________________ (Type or Print Name) -2- STATE OF New York ) _______________ ) ) SS COUNTY OF New York ) ______________ ) I, Catherine Jones, a Notary Public in and for said County, in the State aforesaid, do hereby certify that Andries Ruijssenaars, President of Eagle-Picher Industries, Inc., an Ohio corporation, and James A. Ralston, Secretary of said corporation, who are personally known to me to be the same persons whose names are subscribed to the foregoing instrument as such President and _______________ Secretary, respectively, appeared before me this day in person and acknowledged that they signed and delivered the said instrument as their own free and voluntary act and as the free and voluntary act and deed of said corporation for the uses and purposes therein set forth; and the said ________________ Secretary then and there acknowledged that he, as custodian of the corporate seal of said corporation, did affix the corporate seal of said corporation to said instrument as his own free and voluntary act and as the free and voluntary act of said corporation, for the uses and purposes therein set forth. Given under my hand and notarial seal, this 24th day of February, 1998. /s/ CATHERINE JONES ---------------------------------- (NOTARIAL SEAL) Notary Public CATHERINE JONES ---------------------------------- My Commission Expires: (Type or Print Name) 11/17/99 - --------------------------------- -3- STATE OF New York ) _______________ ) ) SS COUNTY OF New York ) ______________ ) I, Catherine Jones, a Notary Public in and for said County, in the State aforesaid, do hereby certify that Gregory D. Amoroso, Group Vice President of ABN AMRO Bank N.V., a bank organized under the laws of The Netherlands, who is personally known to me to be the same person whose name is subscribed to the foregoing instrument as such Group Vice President appeared before me this day in person and acknowledged that he signed and delivered the said instrument as his own free and voluntary act and as the free and voluntary act and deed of said corporation for the uses and purposes therein set forth. Given under my hand and notarial seal, this 24th day of February, 1998. /s/ CATHERINE JONES ---------------------------------- (NOTARIAL SEAL) Notary Public CATHERINE JONES ---------------------------------- My Commission Expires: (Type or Print Name) 11/17/99 - --------------------------------- STATE OF New York ) _______________ ) ) SS COUNTY OF New York ) ______________ ) I, Catherine Jones, a Notary Public in and for said County, in the State aforesaid, do hereby certify that Paul Widuch, Group Vice President of ABN AMRO Bank N.V., a bank organized under the laws of The Netherlands, who is personally known to me to be the same person whose name is subscribed to the foregoing instrument as such Group Vice President appeared before me this day in person and acknowledged that he signed and delivered the said instrument as his own free and voluntary act and as the free and voluntary act and deed of said corporation for the uses and purposes therein set forth. Given under my hand and notarial seal, this 24th day of February, 1998. /s/ CATHERINE JONES ---------------------------------- (NOTARIAL SEAL) Notary Public CATHERINE JONES ---------------------------------- My Commission Expires: (Type or Print Name) 11/17/99 - --------------------------------- SCHEDULE A-1 TO PATENT COLLATERAL AGREEMENT U.S. PATENT NUMBERS AND PENDING U.S. PATENT APPLICATION NUMBERS - ---------------------------------------------------------------------------------------------------------------- U.S. PATENT EXPIRATION NUMBER TITLE OF PATENT INVENTOR(S) DATE ISSUED DATE - ---------------------------------------------------------------------------------------------------------------- 4,249,930 Ionic Compounds Formed From Iron and Urea Atkisson 2/10/81 3/8/99 - ---------------------------------------------------------------------------------------------------------------------- 4,292,357 Zinc/Zinc Oxide Laminated Anode Assembly Erisman et al. 9/29/81 7/25/99 - ---------------------------------------------------------------------------------------------------------------------- 4,422,667 Suspension For A Tractor-Scraper Perry 12/27/83 12/30/2001 - ---------------------------------------------------------------------------------------------------------------------- 4,425,412 Lead/Acid Battery Having Horizontal Plates Dittmann et al. 1/10/84 5/26/2002 - ---------------------------------------------------------------------------------------------------------------------- 4,477,540 Metal-Gas Cell With Electrolyte Reservoir Miller et al. 10/16/84 10/3/2003 - ---------------------------------------------------------------------------------------------------------------------- 4,477,546 Lattice For A Battery Electrode Substrate Wheeler et al. 10/16/84 2/3/2003 - ---------------------------------------------------------------------------------------------------------------------- 4,537,759 Production Of Elemental Silicon From Impure Walker et al. 8/27/85 6/27/2003 Silane Feed - ---------------------------------------------------------------------------------------------------------------------- 4,554,056 Impregnation Of Nickel Electrodes Using Whitford 11/19/85 4/18/2005 Electric PH Control Circuits - ---------------------------------------------------------------------------------------------------------------------- 4,626,335 Lithium Alloy Anode For Thermal Cells Cupp et al. 12/2/86 9/26/2005 - ---------------------------------------------------------------------------------------------------------------------- 4,663,819 Method of Mounting A Metal Yoke To A Traylor 5/12/87 11/4/2005 Composite Tube - ---------------------------------------------------------------------------------------------------------------------- 4,699,965 Heat Curable Solventless Liquid Prepolymer Markle et al. 10/13/87 6/28/2005 And Novel Monomer Derived Hexylcarbitol For Use Therewith - ---------------------------------------------------------------------------------------------------------------------- 4,772,296 Method of Purifying And Depositing Group Potts 9/20/88 5/12/2007 IIIA and Group VA Compounds To Produce Epitaxial Films - ---------------------------------------------------------------------------------------------------------------------- 4,812,521 Elastomer Modified Epoxies Markle 3/14/89 9/21/2007 - ---------------------------------------------------------------------------------------------------------------------- 4,894,299 Cell Having A Dome-Shaped Solid Ceramic Morse 1/16/90 12/2/2008 Electrolyte - ---------------------------------------------------------------------------------------------------------------------- 4,939,271 Mercapto-Modified N-(R-Oxymethyl) Markle 7/3/90 1/5/2009 Acrylamide-Rubber/Formable Monomer/(Meth) Acrylonitrile Terpolymers - ---------------------------------------------------------------------------------------------------------------------- -5- 4,952,195 Graphite Drive Shaft Assembly Traylor 8/28/90 9/28/2007 - ---------------------------------------------------------------------------------------------------------------------- 4,979,632 Portable Vessel For The Safe Storage of Lee 12/25/90 5/9/2010 Explosives - ---------------------------------------------------------------------------------------------------------------------- 4,986,721 Extendable Boom Fork Life Vehicle Lowder et al. 1/22/91 9/17/2009 - ---------------------------------------------------------------------------------------------------------------------- 5,189,819 Trenching Apparatus Holloway et al. 3/2/93 5/8/2011 - ---------------------------------------------------------------------------------------------------------------------- 5,228,222 Digging And Propulsion Unit For A Trenching Holloway et al. 7/20/93 9/17/2012 Apparatus - ---------------------------------------------------------------------------------------------------------------------- 5,247,743 Method And Apparatus For Digging Trenches Holloway et al. 9/28/93 7/2/2012 - ---------------------------------------------------------------------------------------------------------------------- 5,249,379 Mounting Structure For The Linear Actuators Baker et al. 10/5/93 9/15/2012 Of A Trenching Apparatus - ---------------------------------------------------------------------------------------------------------------------- 5,257,463 Method And Apparatus For Cooling Or Heating Wheeler et al. 11/2/93 5/5/2012 Battery Cells During Electrical Testing - ---------------------------------------------------------------------------------------------------------------------- 5,416,962 Method of Manufacture of Vibration Damper Passarella 5/23/95 12/8/2013 - ---------------------------------------------------------------------------------------------------------------------- 5,464,701 Leakproof, Valve Regulated, Rey 11/7/95 2/27/2015 Maintenance-Free Lead Acid Battery - ---------------------------------------------------------------------------------------------------------------------- 5,518,833 Nonwoven Electrode Construction Repplinger et al. 5/21/96 5/24/2014 - ---------------------------------------------------------------------------------------------------------------------- 5,564,448 Container Washing Apparatus And System Lincoln 10/15/96 12/14/2014 - ---------------------------------------------------------------------------------------------------------------------- Des. 367,255 Battery Rey 2/20/96 2/20/2010 - ---------------------------------------------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- SCHEDULE A-2 - -------------------------------------------------------------------------------- TO PATENT COLLATERAL AGREEMENT PATENT LICENSES -- NONE KNOWN --