Method for evaluating smooth surfaces
CA 1323932 C · Owner: Ashland Oil, Inc. · Inventors: Hupp, Stephen S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract The short-term and long-term waviness of a smooth surface is determined quantitatively by means of a method which impinges light radiation onto the surface, detects the resultant light image and, mathematically processes that image. The method permits a fast, non-contact evaluation of a smooth surface with good correlation between the calculated values and the visual observation.
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
- Granted November 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 2010.
- 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.