Compact wrist telephone
CA 2108535 C · Owner: Marcus, Larry Allen · Inventors: Khanna, Satya Pal; Marcus, Larry Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compact telephone, which may be fastened to a user's wrist by means of a strap 310, 320, includes a case 100 having an upper portion 110 that is hinged along one edge to a lower portion 210. A receiver transducer 140 is embedded within the upper portion on the side opposite the hinge and a microphone transducer 240 is embedded within the lower portion on the side opposite the hinge so that the distance between them is maximized when the case is opened. By providing such separation inter-transducer, distance is increased and this results in improved signal-to-noise performance. Such performance is further improved by using a directional microphone which is more responsive to sounds coming …
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 October 15, 1993 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 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.