Harold W. Helmke

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Kingwood, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Process for improving purity of para-xylene product
- Patent number 6,489,527
- Issue date Dec 3, 2002
- John Di-Yi Ou
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for upgrading steam cracker tars
- Patent number 5,443,715
- Issue date Aug 22, 1995
- Exxon Chemical Patents Inc.
- Dane C. Grenoble
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Method for upgrading steam cracker tars
- Patent number 5,215,649
- Issue date Jun 1, 1993
- Exxon Chemical Patents Inc.
- Dane C. Grenoble
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...

Patents Applicationslast 30 patents

Information Patent Application
Process for producing para-xylene
- Publication number 20070249882
- Publication date Oct 25, 2007
- John Di-Yi Ou
- C07 - ORGANIC CHEMISTRY