Inventor · disambiguated record
Helmut Kampfer
Also filed as: KAMPFER HELMUT
14 granted patents·136 citations·filing 1972–1992
91Inventor score
Files withAGFA GEVAERT AG14
Top patents by PatentIndex Score
14 records- 0192US4543308APhotographic recording processAGFA GEVAERT AG·Filed 1983·Granted Sep 24, 1985·38 cites·9 claims
- 0287US3933507APhotographic light-sensitive and heat developable materialAGFA GEVAERT AG·Filed 1972·Granted Jan 20, 1976·49 cites·14 claims
- 0369US5266451AColor photographic recording materialAGFA GEVAERT AG·Filed 1992·Granted Nov 30, 1993·7 cites·9 claims
- 0469US4483799AHydroxy alkane sulfonic acid sulfoalkyl estersAGFA GEVAERT AG·Filed 1981·Granted Nov 20, 1984·8 cites·2 claims
- 0567US4987063AGradation variable black- and -white paperAGFA GEVAERT AG·Filed 1988·Granted Jan 22, 1991·10 cites·4 claims
- 0664US4883880AProcess for the preparation of sulfoalkyl quaternary salts and for the production of alkane sultonesAGFA GEVAERT AG·Filed 1983·Granted Nov 28, 1989·5 cites·13 claims
- 0758US5006455AGradation-variable black-and-white paperAGFA GEVAERT AG·Filed 1988·Granted Apr 9, 1991·7 cites·5 claims
- 0844US4539408AProcess for the preparation of sulphoalkyl quaternary saltsAGFA GEVAERT AG·Filed 1978·Granted Sep 3, 1985·2 cites·7 claims
- 0942US4504668AProcess for the preparation of N-sulfoalkyl quaternary salts of nitrogen heterocyclicsAGFA GEVAERT AG·Filed 1981·Granted Mar 12, 1985·2 cites·9 claims
- 1041US5077183AColor photographic recording material and a process for the preparation of a photographic silver halide emulsionAGFA GEVAERT AG·Filed 1990·Granted Dec 31, 1991·2 cites·6 claims
- 1140US4636460APhotographic recording material and process for the production of photographic imagesAGFA GEVAERT AG·Filed 1985·Granted Jan 13, 1987·3 cites·3 claims
- 1234US4308390AProcess for the production of sulphoalkyl quaternary saltsAGFA GEVAERT AG·Filed 1980·Granted Dec 29, 1981·1 cites·3 claims
- 1333US4576907AColor-photographic recording materialAGFA GEVAERT AG·Filed 1984·Granted Mar 18, 1986·1 cites·10 claims
- 1431US3951664ALight-sensitive material having developers embedded thereinAGFA GEVAERT AG·Filed 1974·Granted Apr 20, 1976·1 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →