Separating sheet glass
CA 2104155 A1 · Owner: Pardue, William Frederick, Jr. · Inventors: Pardue, William Frederick, Jr.; Shinkai, Masayuki; Allaire, Roger Alphee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method and apparatus for separating a sheet of glass along a score line on the sheet. The method involves flexing the glass at the score line along an axis of flexure on a support member and prestressing the glass to a level below the critical stress level, and then applying a critical stress at or above the critical stress level to break the glass along the score line. The apparatus includes a support for the sheet including a fulcrum defining an axis of flexure for alignment with the score line, and at least two pressure members spaced above and on each side of the score line. At least one of the pressure members or the fulcrum has a resiliently deformable …
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 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2015.
- 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.