Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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John O. Schaefer — 7 Patents

IBM: 6 patents #16,491 of 70,183Top 25%
LILexmark International: 1 patents #1,400 of 1,618Top 90%
Lexington, KY: #434 of 2,526 inventorsTop 20%
Kentucky: #1,656 of 11,577 inventorsTop 15%
Overall (All Time): #680,018 of 4,157,543Top 20%
7 Patents All Time
John O. Schaefer has been granted 7 US patents while listed as an inventor at IBM. The first was granted in 1980 and the most recent in December 1993. John O. Schaefer ranks #680,018 of 4,157,543 US inventors in our database (top 16.4%). Patent records list John O. Schaefer in Lexington, KY, US.

Patents per Year

Patents granted per year, 1980 to 1993Bar chart with a peak of 3 patents in 1982.peak 31980: 1 patents19801981: 1 patents19811982: 3 patents19821984: 1 patents19841993: 1 patents1993

Issued Patents All Time

Showing 1–7 of 7 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5268726 Electrophotographic reproduction apparatus having improved fuser to prevent wrinkling of envelopes using intermittent pressure Stephen Alexander Oleksa, Larry J. Rice 1993-12-07
4475830 Spliceless ribbon structure having leader and trailer and method of manufacture therefor 1984-10-09 $20,988,000
4353657 Ribbon feed mechanism and correction tape feed mechanism for a typewriter 1982-10-12 $13,644,000
4350453 Cartridge for correction media or tacky tape with a wrap spring Thomas R. Field, Peter F. Jagodzinski, James F. King 1982-09-21 $18,123,000
4347007 Typewriter cartridge and feed mechanism therefor 1982-08-31 $20,205,000
4302118 Typewriter cartridge and feed mechanism therefor 1981-11-24 $16,683,000
4229112 Random stuffer ribbon cartridge with improved ribbon exit control 1980-10-21 $15,554,000