David J. Twichell — 4 Patents at Blackstone

David J. Twichell has been granted 4 US patents while listed as an inventor at Blackstone. The first was granted in 1985 and the most recent in December 1991. David J. Twichell ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list David J. Twichell in New York, NY, US.

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5076557	Twist indicator gasket	Paul K. Beatenbough, Lavoyce Dey	1991-12-31
5031924	Twist indicator gasket	Paul K. Beatenbough, Lavoyce Dey	1991-07-16
4997035	Joint crevice corrosion inhibitor	Paul K. Beatenbough, Lavoyce Dey	1991-03-05
4501321	After cooler, charge air cooler and turbulator assemblies and methods of making the same	John D. Real, Lauren R. Weed	1985-02-26	$1,295,000

David J. Twichell — 4 Patents

Issued Patents All Time

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