Improvement in automated, laser aligned leveling apparatus
CA 2188456 C · Owner: Garceveur Corporation · Inventors: Hohmann, Howard E. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The laser alignment system (49) of the apparatus for leveling flowable material in which two radiant energy beam detectors (51 53), mounted on opposite ends of an elongated leveling member (15) are responsive to a projected radiant energy beam establishing a leveling plane (59), is modified for operation when one of the detectors (51 53) is blocked from receiving the projected beam by an obstruction such as a support column (68), equipment or personnel. Whereas each detector signal is normally used to generate a separate adjustment signal for an adjustment device such as a hydraulic cylinder (31 37) to raise and lower the associated end of the elongated leveling member (15), when one …
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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 February 16, 1996 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2018.
- 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
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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.