A trowel having imposed blade stresses and method of manufacture
CA 2266087 A1 · Owner: Marshalltown Company · Inventors: Murders, Jack D.; Mccomber, Larry J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trowel and related method of manufacture in which residual stresses are intentionally imposed upon the bottom working surface and/or the top mounting surface, of a trowel blade. Stresses can be imposed for example, by glass bead , peening, shot peening, rolling, and/or brushing the metal trowel blade. Stresses are built up to a, working stress level that remains substantially constant with further use of the trowel, against abrasive, spreadable surfaces. Imposed stresses on the top and bottom surfaces, can also be used to vary the resulting curvature of the blade.
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 17, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2021.
- 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.