Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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David Ritchie — 4 Patents

PIPeter Maccallum Cancer Institute: 1 patents #9 of 46Top 20%
RPRalston Purina: 1 patents #43 of 125Top 35%
Rockport, MA: #38 of 101 inventorsTop 40%
Massachusetts: #27,912 of 88,656 inventorsTop 35%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
David Ritchie has been granted 4 US patents while listed as an inventor at Peter Maccallum Cancer Institute. The first was granted in 1980 and the most recent in November 2021. David Ritchie ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list David Ritchie in Rockport, MA, US.

Patents per Year

Patents granted per year, 1980 to 2021Bar chart with a peak of 1 patents in 1980.peak 11980: 1 patents19801997: 1 patents19972017: 1 patents20172021: 1 patents2021

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
11171848 Network switch Alastair McLeod 2021-11-09
9724329 Stimulating immune response Andy Hsu, Jake Shortt, Paul Neeson, Ricky Wayne Johnstone 2017-08-08
5596948 Animal urine collection and analysis system and its method of use 1997-01-28 $38,082,000
4216831 Golf club attachment for raking sand traps and retrieving golf balls 1980-08-12