FORM 6-K

                        SECURITIES & EXCHANGE COMMISSION

                             Washington, D.C. 20549

                        Report of Foreign Private Issuer

                        Pursuant to Rule 13a-16 or 15d-16

                     Of the Securities Exchange Act of 1934

                                 April 26, 2004

                        Commission File Number 000-30980

                               INFICON Holding AG

                              INFICON Holding Inc.
                 (Translation of registrant's name into English)

                                  INFICON Inc.

                              Two Technology Place

                          East Syracuse, New York 13057
                    (Address of principal executive offices)

     Indicate by check mark whether the registrant files or will file annual
                  reports under cover Form 20-F or Form 40-F:

                        Form 20-F I X I   Form 40-F I I

   Indicate by check mark whether the registrant by furnishing the information
    contained in this Form is also thereby furnishing the information to the
    Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act
                                   of 1934:

                                Yes I I No I X I





                                   INVITATION
                 to the Ordinary General Meeting of Shareholders
       Tuesday, 25th May 2004, 3 p.m. (The doors will be opened at 2 p.m.)
         at INFICON AG, Alte Landstrasse 6, 9496 Balzers, Liechtenstein

ITEMS ON THE AGENDA and PROPOSALS by the BOARD OF DIRECTORS

1.       Approval of the Business Report 2003
      (Annual Report, Annual Financial Statements and Consolidated Financial
      Statements following notification of the reports of the Group and Company
      auditors)

      The Board of Directors proposes to approve the Business Report 2003,
      consisting of the Annual Report, the Consolidated Financial Statements of
      the INFICON Group and the Annual Financial Statements of INFICON Holding
      AG.



                                                                                                
2. Allocation of the Retained Loss of INFICON Holding AG
      Retained Earnings as per January 1, 2003                                     CHF             1'221'000.00

      Loss of the Fiscal Year 2003                                                 CHF          - 15'684'000.00
                                                                                   ----------------------------

      Retained Loss as per December 31, 2003                                       CHF          - 14'463'000.00
                                                                                   ============================

      Transfer from General Reserve to Retained Earnings /
      Retained Loss                                                                CHF            14'463'000.00
                                                                                   ----------------------------

      Retained Earnings as per January 1, 2004                                     CHF                     0.00
                                                                                   ============================


      The Board of Directors proposes that the amount of CHF 14'463'000.00 be
      transferred from General Reserve to Retained Earnings / Retained Loss and
      the Retained Earnings / Retained Loss of CHF 0.00 be carried forward.

3. Discharge of the Members of the Board of Directors
      The Board of Directors proposes the discharge of the members of the Board
      of Directors for their activity during the fiscal year 2003.

4.    Election of Board Members
      John Grad, Chairman, Kurt Muck and James Brissenden have resigned from the
      board of directors as of the Ordinary General Meeting of Shareholders on
      May 25, 2004.

      a.   Re-election of Board Member
           The Board of Directors proposes to re-elect Dr. Thomas Staehelin as
           member of the Board of Directors for a period of 3 years.

      b.   Election of New Board Member
           The Board of Directors proposes to elect Mr. Gustav Wirz as member of
           the Board of Directors for a period of 3 years.

           Mr. Wirz started his professional career in 1970 as head of the R&D
           department of Kulicke & Soffa, one of the pioneers in semiconductor
           equipment manufacturing. In 1974, he joined Seier AG in Switzerland
           as Managing Director. In 1979, Mr. Wirz started his own company,
           Gustav Wirz AG which became Alphasem AG in 1985. In 1987, Mr. Wirz
           was elected to the SEMI board, the worldwide industry association of
           the semiconductor equipment and materials industry. He was the first
           non-U.S. director. In 1999, he sold the company to the Dover
           Corporation. Today he is a private investor, and he serves on the
           boards of several companies, including Alphasem, NetInvest, QC
           Solutions (USA), Best-Immo-Invest and Exalos. He is a member of the
           council of technical college of eastern Switzerland. Mr. Wirz studied
           mechanical engineering at the technical college in Biel, Switzerland.



5.    Appointment of Auditors and Group Auditors
      The Board of Directors proposes the appointment of PricewaterhouseCoopers
      AG, Zurich, for a further year as Auditors and Group Auditors.


Documents
      The Business Report 2003 (together with Annual Report, Annual Financial
      Statements and Consolidated Financial Statements), as well as the original
      reports of the Group and Company Auditors, will be available for
      inspection by the shareholders with effect from the 26th April 2004 at the
      registered offices of the Company at Hintergasse 15B, 7310 Bad Ragaz,
      Switzerland. Registered shareholders have been sent a copy of the Business
      Report 2003 together with the invitation.

Admission cards
      Shareholders with voting rights, who are recorded in the share register on
      the 26th April 2004, have been sent the invitation to the Ordinary General
      Meeting of Shareholders consisting of the items on the agenda and the
      proposals by the Board of Directors and including the Business Report
      2003, the application form, and a reply envelope.

      On return of the application form in the reply envelope on or prior to the
      13th May 2004, they will be sent the admission and voting cards.
      Registered shareholders who sell their shares prior to the Ordinary
      General Meeting of Shareholder are no longer entitled to vote.

Representation / Proxy
      Shareholders who do not personally attend the Ordinary General Meeting of
      Shareholders can be represented as follows:

     --   by a representative: Complete the application form and mail it in the
          reply envelope to SAG. You will receive the admission and voting
          cards. Please fill out the proxy and give the admission and voting
          cards to your representative;

     --   by the independent proxy holder Prof. Dr. iur. Lukas Handschin,
          Attorney, Bahnhofplatz 9, 8001 Zurich, Switzerland: Please fill out
          the application form accordingly and mail it in the reply envelope to
          SAG. The admission card does not have to be requested;

     --   by INFICON Holding AG: Please fill out the application form
          accordingly and mail it in the reply envelope to SAG. The admission
          card does not have to be requested.

      In addition to choosing to send the proxy to the independent proxy holder
      or to INFICON Holding AG, you can also issue written instructions for the
      purpose of casting votes. If you do not make use of this option, the
      independent proxy holder or INFICON Holding AG will exercise the right to
      vote pursuant to the proposals of the Board of Directors.

      Portfolio representatives as understood by Article 689d OR are requested
      to notify the Company in good time, no later however than by the 25th May
      2004, 2:00 p.m. CEST, at the reception desk for the Ordinary General
      Meeting of Shareholders, of the number of shares they represent.

Information
      Please address all correspondence relating to the Ordinary General Meeting
      of Shareholders to S A G SIS  Aktienregister  AG,  Baslerstrasse  90,
      CH-4609 Olten,  Tel. ++41 (0)62 311 61 77, Fax: ++41 (0)62 205 39 71.

      We look forward to welcoming the participating shareholders to cocktails
      following the Ordinary General Meeting of Shareholders.


      Yours sincerely,

      INFICON Holding AG
      For the Board of Directors:

      John Grad, Chairman


      Bad Ragaz, 26th April 2004





Enclosure: Invitation dated April 26, 2004 to the Ordinary General Meeting of
Shareholders.


                                   Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

Date:  April 28, 2004             INFICON Holding AG


                                  By: /s/ Peter G. Maier
                                      ------------------------------------------
                                      Name:  Peter G. Maier
                                      Title: Vice President and Chief Financial
                                             Officer