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USPTO Patent Rankings Data through Dec 31, 2025
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David E. Howcroft — 2 Patents

UNUnknown: 2 patents #12,644 of 83,584Top 20%
Yucaipa, CA: #39 of 120 inventorsTop 35%
California: #187,151 of 386,348 inventorsTop 50%
Overall (All Time): #1,709,992 of 4,157,543Top 45%
2 Patents All Time
David E. Howcroft has been granted 2 US patents while listed as an inventor at Unknown. All of these patents were granted in 1988. David E. Howcroft ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list David E. Howcroft in Yucaipa, CA, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4787445 Hermetically sealed, relatively low pressure cooling system for internal combustion engines and method therefor 1988-11-29
4739824 Hermetically sealed, relatively low pressure cooling system for internal combustion engines and method therefor 1988-04-26