Laser beam scanner
CA 2058669 C · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Nakazawa, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser beam scanner for use in a code reader or the like including more than two optical-path-length changing units inserted in the beam path to change the optical path length of the beam between the beam emitting unit and the scanning unit such that the distance from the scanner to the focal point of the beam can be changed. The optical-path-length changing units are controlled by a control unit which receives an output from a distance measuring unit. The distance measuring unit measures the distance from the laser beam scanner to the object to be scanned and indicates to the control unit to adjust the optical-path-length so that the focal point of the beam is at the same distance as the …
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 December 31, 1991 and granted November 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 31, 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.