Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Diffracto › Donald A. Clarke
DC

Donald A. Clarke — 16 Patents

DIDiffracto: 16 patents #3 of 16Top 20%
Windsor, CA: #36 of 864 inventorsTop 5%
Overall (All Time): #284,196 of 4,157,543Top 7%
16 Patents All Time
Donald A. Clarke has been granted 16 US patents while listed as an inventor at Diffracto. The first was granted in 1981 and the most recent in April 1993. Donald A. Clarke ranks #284,196 of 4,157,543 US inventors in our database (top 6.8%). Patent records list Donald A. Clarke in Windsor, ON, CA.

Patents per Year

Patents granted per year, 1981 to 1993Bar chart with a peak of 2 patents in 1985.peak 21981: 1 patents19811982: 1 patents1983: 1 patents19831984: 1 patents1985: 2 patents19851986: 2 patents1987: 1 patents19871989: 1 patents1990: 2 patents19901991: 2 patents1992: 1 patents19921993: 1 patents1993

Issued Patents All Time

Showing 1–16 of 16 patents

Patent #TitleCo-InventorsDate
5206700 Methods and apparatus for retroreflective surface inspection and distortion measurement Rodger L. Reynolds, Timothy R. Pryor 1993-04-27
5168322 Surface inspection using retro-reflective light field Rodger L. Reynolds, Timothy R. Pryor 1992-12-01
5074661 Methods and apparatus for retroreflective surface inspection and distortion measurement Rodger L. Reynolds, Timothy R. Pryor 1991-12-24
5004339 Method and apparatus for determining physical characteristics of objects and object surfaces Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner 1991-04-02
4920385 Panel surface flaw inspection Rodger L. Reynolds, Timothy R. Pryor 1990-04-24
4907888 Non destructive testing and other applications using retroreflective illumination Rodger L. Reynolds, Timothy R. Pryor 1990-03-13
4863268 Diffractosight improvements Rodger L. Reynolds, Timothy R. Pryor 1989-09-05
4686374 Surface reflectivity detector with oil mist reflectivity enhancement Nicholas Liptay-Wagner, Roland Renaud, Timothy R. Pryor 1987-08-11
4629319 Panel surface flaw inspection Rodger L. Reynolds, Timothy R. Pryor 1986-12-16
4585947 Photodetector array based optical measurement systems Nicholas Liptay-Wagner, Roland Renaud, Timothy R. Pryor 1986-04-29
4506980 Method and apparatus for determining physical characteristics of objects and object surfaces Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner 1985-03-26
4493554 Method and apparatus for determining physical characteristics of objects and object surfaces Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner 1985-01-15
4465374 Method and apparatus for determining dimensional information concerning an object Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner 1984-08-14
4394683 New photodetector array based optical measurement systems Nicholas Liptay-Wagner, Roland Renaud, Timothy R. Pryor 1983-07-19
4326808 Method and apparatus for determining physical characteristics of object outer surfaces Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner, Blaine Richards 1982-04-27
4305661 Method and apparatus for determining physical characteristics of objects and object surfaces Timothy R. Pryor, Omer L. Hageniers, Walter J. Pastorius, Nicholas Liptay-Wagner 1981-12-15

Frequent Collaborators

Timothy R. Pryor16 shared
Nicholas Liptay-Wagner9 shared
Rodger L. Reynolds7 shared
Walter J. Pastorius6 shared
Omer L. Hageniers6 shared
Roland Renaud3 shared

Nearby-Ranked Inventors

Chung-Lin Fu16
Tyrone T. Chen16
Shivendra Katiyar16
Kevin E. Kalajan16
Henry Y. Mark16
Marco Becker16
Nak Gi Sung16
Kenta Iwai16
Brock Mammoser16