Witt; Donald R.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Witt; Donald R..The latest application filed is for "controlled addition of alkali or alkaline earth salts to a chromium oxide catalyst".

Company Profile

0.18.0

Witt; Donald R. - Bartlesville OK

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Controlled addition of alkali or alkaline earth salts to a chromium oxide catalyst Grant 5,444,132 - Witt , et al. August 22, 1	1995-08-22
Polymerization catalysts and processes Grant 5,284,811 - Witt , et al. February 8, 1	1994-02-08
Olefin polymerization catalysts and preparation method Grant 5,073,531 - Witt December 17, 1	1991-12-17
Polymerization using a support formed by heating silica gel in inert atmosphere Grant 4,436,883 - Witt March 13, 1	1984-03-13
Heating silica gel in inert atmosphere before activation Grant 4,392,990 - Witt July 12, 1	1983-07-12
Silica production Grant 4,246,139 - Witt January 20, 1	1981-01-20
Catalyst support prepared by alcohol treatment of hydrogels Grant 4,152,503 - Short , et al. May 1, 1	1979-05-01
Continuous, multiple zone fluidized bed for particle treater Grant 4,136,061 - Hogan , et al. January 23, 1	1979-01-23
Catalyst support prepared by alcohol treatment of hydrogels Grant 4,081,407 - Short , et al. March 28, 1	1978-03-28
Reactivation of organochromium olefin polymerization catalyst in presence of oxygen Grant 4,001,196 - Witt January 4, 1	1977-01-04
Catalyst support formed by adding acidic material to silica containing titanium Grant 3,950,316 - Witt April 13, 1	1976-04-13
Large pore silica and polymerization catalyst Grant 3,948,806 - Witt April 6, 1	1976-04-06
Olefin polymerization catalyst Grant 3,900,457 - Witt August 19, 1	1975-08-19
Large Pore Silicas Grant 3,875,079 - Witt April 1, 1	1975-04-01
Large Pore Silica Gel Catalysts Grant 3,862,104 - Witt January 21, 1	1975-01-21
Colorimetric Oxygen Detectors Grant 3,663,176 - Cagle , et al. May 16, 1	1972-05-16
Ethylene Polymerization Using Catalyst Of Controlled Particle Size Grant 3,624,063 - Witt November 30, 1	1971-11-30
Olefin Polymerization With Chromium And Titanium-containing Compounds Grant 3,622,521 - Hogan , et al. November 23, 1	1971-11-23

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