Inventor · disambiguated record
John O. Schaefer
Also filed as: SCHAEFER JOHN O · SCHAEFER JOHN O'N
10 granted patents·160 citations·filing 1977–1992
90Inventor score
Top patents by PatentIndex Score
10 records- 0185US4302118ATypewriter cartridge and feed mechanism thereforIBM·Filed 1980·Granted Nov 24, 1981·39 cites·36 claims
- 0283US4347007ATypewriter cartridge and feed mechanism thereforIBM·Filed 1977·Granted Aug 31, 1982·26 cites·18 claims
- 0379US4350453ACartridge for correction media or tacky tape with a wrap springIBM·Filed 1980·Granted Sep 21, 1982·28 cites·3 claims
- 0476US4353657ARibbon feed mechanism and correction tape feed mechanism for a typewriterIBM·Filed 1979·Granted Oct 12, 1982·19 cites·4 claims
- 0568US4475830ASpliceless ribbon structure having leader and trailer and method of manufacture thereforIBM·Filed 1982·Granted Oct 9, 1984·15 cites·15 claims
- 0662USD253354SCartridge for a typewriterIBM·Filed 1978·Granted Nov 6, 1979·8 cites·1 claims
- 0756US5268726AElectrophotographic reproduction apparatus having improved fuser to prevent wrinkling of envelopes using intermittent pressureLEXMARK INT INC·Filed 1992·Granted Dec 7, 1993·12 cites·15 claims
- 0855USD253312SCartridge for a typewriterIBM·Filed 1978·Granted Oct 30, 1979·6 cites·1 claims
- 0942US4229112ARandom stuffer ribbon cartridge with improved ribbon exit controlIBM·Filed 1978·Granted Oct 21, 1980·4 cites·3 claims
- 1041USD253239SCartridge assembly for a typewriterIBM·Filed 1977·Granted Oct 23, 1979·3 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →