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William M. Ehrhardt — 1 Patent

Shell Oil Compny: 1 patents #2,223 of 4,423Top 55%

Houston, TX: #12,430 of 21,073 inventorsTop 60%

Texas: #74,151 of 125,132 inventorsTop 60%

Overall (All Time): #2,406,284 of 4,157,543Top 60%

1 Patents All Time

William M. Ehrhardt has been granted 1 US patent while listed as an inventor at Shell Oil Compny. All of these patents were granted in 1981. William M. Ehrhardt ranks #2,406,284 of 4,157,543 US inventors in our database (top 57.9%). Patent records list William M. Ehrhardt in Houston, TX, US.

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
4243007	Selective ignition timing	Earl J. Haury	1981-01-06	$60,644,000

William M. Ehrhardt — 1 Patent

Issued Patents All Time

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