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USPTO Patent Rankings Data through Dec 31, 2025
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Calvin E. Grubbs — 3 Patents

TIThomas Industries: 3 patents #14 of 97Top 15%
Garland, TX: #377 of 1,186 inventorsTop 35%
Texas: #41,402 of 125,132 inventorsTop 35%
Overall (All Time): #1,328,092 of 4,157,543Top 35%
3 Patents All Time
Calvin E. Grubbs has been granted 3 US patents while listed as an inventor at Thomas Industries. The first was granted in 1984 and the most recent in February 1988. Calvin E. Grubbs ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Calvin E. Grubbs in Garland, TX, US.

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
4723098 Electronic ballast circuit for fluorescent lamps 1988-02-02 $1,360,000
4477748 Solid state ballast 1984-10-16 $901,000
4435749 High frequency inverter fault protection system 1984-03-06 $1,075,000