Safety razor blade
CA 2079330 A1 · Owner: The Gillette Company · Inventors: Trotta, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A blade (14) for use in a safety razor (10) is manufactured by providing a block of green or uncured ceramic material (16). The block (16) is in the form of a honeycomb structure having a plurality of substantially parallel cells (18) formed therein and a portion (P) is sliced and removed from the block (16) forming at least one surface on the portion intersecting the parallel cells at an angle. The portion (P) is cured, and the surface ground and polished to provide a plurality of cutting edges (18).
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 March 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.