Face plate
CA 2075877 A1 · Owner: Mount Isa Mines Limited · Inventors: Stewart, Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A generally square face plate (1) for use with a 16 mm threaded rockbolt (2) includes a centrally located generally hemispherical raised portion (3) top surface, (4) and a curved engagement surface (5) for abutting an excavated surface into which a rockbolt is to be installed. An aperture (6) is centrally disposed in portion (3) for receiving the threaded end of rockbolt (2) for allowing tensioning of the rockbolt. A circumferential corrugation (10) is adjacent to and surrounds portion (3). Four radially corrugations (11, 12, 13, 14) extend from portions (3) through, corrugation (10), two respective corners (15 16, 17, 18) of, plate (1). The corrugations co-operate to allow plate (1) to be …
Read the whole patent
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 August 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2014.
- 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.