Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Douglas P. Schaefer — 3 Patents

STStorage Technology: 3 patents #182 of 682Top 30%
Lafayette, CO: #282 of 681 inventorsTop 45%
Colorado: #13,288 of 40,980 inventorsTop 35%
Overall (All Time): #1,328,092 of 4,157,543Top 35%
3 Patents All Time
Douglas P. Schaefer has been granted 3 US patents while listed as an inventor at Storage Technology. The first was granted in 1992 and the most recent in August 1995. Douglas P. Schaefer ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Douglas P. Schaefer in Lafayette, CO, US.

Patents per Year

Patents granted per year, 1992 to 1995Bar chart with a peak of 1 patents in 1992.peak 11992: 1 patents19921994: 1 patents19941995: 1 patents1995

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5446853 System for buffering track image at each read/write head in a disk drive unit having multiple read/write heads Robert E. Dean, Steven Craig Cacka, Hossein F. Sevvom, Robert A. Brumnet 1995-08-29 $8,005,000
5341479 Address mark triggered read/write head buffer Robert E. Dean, Steven Craig Cacka, Hossein F. Sevvom, Robert A. Brumnet 1994-08-23 $17,578,000
5155811 Read/write head buffer Robert E. Dean, Steven Craig Cacka, John F. Kitchen, Hossein F. Sevvom, Robert A. Brumnet 1992-10-13 $4,400,000