Expired Canadian patentCanada
Borehole televiewer mudcake monitor
CA 1303720 C · Owner: Shell Canada Limited · Inventors: Clerke, Edward A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In connection with a borehole televiewer system (10) the, delta time (51) between low threshold (54) crossing (T1) and signal peak arrival (T2) provides a measure of mudcake (43) thickness.
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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 June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 11, 1987
GrantedJune 16, 1992
Term endedJune 16, 2009
Patent numberCA 1303720 C
Classification (IPC)G01V1/40 +2 more
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.