Method and apparatus for viewing a bore hole
CA 2101747 A1 · Owner: Campbell, Jerry W. · Inventors: Dimascio, Michael S.; Olsson, Mark S.; Campbell, Jerry W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A down hole camera apparatus (10) includes a housing (12) for holding a camera (66) and a transmitter. The camera is adapted to capture and store a picture. The transmitter transmits the stored picture to a remote location at a frequency less than 7,000 Hz. Advantageously this makes the apparatus compatible with operation over twisted pair cables (c) of the types standard in the industry. A receiving system (67) at the remote location receives the transmitted signal. Preferably, the receiving system includes a pair of receivers (198, 199). One receiver holds and displays a transmitted picture while another receiver simultaneously receives a picture being transmitted. A controller switches …
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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
- Filed November 27, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2013.
- 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.