In situ oil shale retorting
CA 1104489 A · Owner: Occidental Oil Shale, Inc. · Inventors: Cha, Chang Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
28-OS-77, 1. BE IT KNOWN THAT CHANG YUL CHA of 1904 Glenmont Drive Bakersfield, California 93309, United States of America having made an invention entitled:, "In situ oil shale retorting" the following disclosure contains a correct and full description of the invention and of the best mode known to the inventor of taking advantage of the same. ABSTRACT A locus of processing zone advancing during retorting through a fragmented permeable mass of particles containing oil shale in an in situ oil shale retort in a subterranean formation containing oil shale is determined by monitoring off gas passing from the retort to determine the content in the off gas of a selected constituent formed by …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.