Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Keith A. Nau — 10 Patents

Xerox: 10 patents #1,323 of 8,622Top 20%
Webster, NY: #317 of 1,485 inventorsTop 25%
New York: #14,754 of 115,490 inventorsTop 15%
Overall (All Time): #481,000 of 4,157,543Top 15%
10 Patents All Time
Keith A. Nau has been granted 10 US patents while listed as an inventor at Xerox. The first was granted in 1987 and the most recent in June 2009. Keith A. Nau ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list Keith A. Nau in Webster, NY, US.

Patents per Year

Patents granted per year, 1987 to 2009Bar chart with a peak of 2 patents in 2003.peak 21987: 1 patents19871990: 1 patents19901994: 1 patents19942003: 2 patents20032007: 1 patents20072008: 2 patents20082009: 2 patents2009

Issued Patents All Time

Showing 1–10 of 10 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
7546069 Xerographic developer unit having multiple magnetic brush rolls with a grooved surface Ajay Kumar, Jonathan D. Sadik, David A. Reed, Cory Joseph Winters 2009-06-09 $2,870,000
7532830 Environmental controls for operation of an electrostatographic developer unit having multiple magnetic brush rolls Ajay Kumar, Hirotsugu Oba, David A. Reed, Cory Joseph Winters, Michael D. Thompson +7 more 2009-05-12 $3,187,000
7389073 Electrostatographic developer unit having multiple magnetic brush rolls having dissimilar compositions Ajay Kumar, David A. Reed, Hirotsugu Oba 2008-06-17 $8,152,000
7356292 Electrostatographic developer unit having multiple magnetic brush rolls with a magnetic restrictor for carrier particle emission control Ajay Kumar, David A. Reed, Hirotsugu Oba, Jonathan D. Sadik, Richard L. Kjar 2008-04-08 $5,291,000
7206538 Xerographic developer unit with specialized exit port for developer material Ajay Kumar, Jonathan D. Sadik, David A. Reed, Richard L. Kjar 2007-04-17 $4,926,000
6671478 Injection molded noise attenuator for a photoreceptor Alan M. Litman, Rafael Malespin 2003-12-30 $4,951,000
6572801 Method of forming an injection molded part having a zero draft side Alan M. Litman, Rafael Malespin 2003-06-03 $9,686,000
5339139 Document feeder with positive document removal from imaging platen Jack K. Fullerton, Richard A. Beck, Fred B. Clark, Gordon B. Reid 1994-08-16 $3,568,000
4967233 Fixed full width array scan head calibration apparatus Wayne A. Buchar, Pierre A. Lavallee 1990-10-30 $3,612,000
4699497 Illumination lamp assembly for a document scan system John H. Hinton, Roger W. Budnik 1987-10-13 $10,783,000