Sound activated transmitter
CA 2220482 C · Owner: Desa Ip, Llc · Inventors: Waugh, David T.; Orloff, Leslie M.; Paley, Gary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A remote annunciator system as shown in the figure in which the emission of an acoustic signal by a first annunciator (1) is detected by an acoustic signal detector (5) which causes a radio frequency transmitter (11) to transmit a radio frequency signal. A radio frequency receiver (15 16) which receives the , signal operates a second annunciator (23 24) which is remote from the first , annunciator to cause the second annunciator to emit an audible or visual signal. Preferably, the radio frequency signal is encoded and is decoded at the receiver, and if the first annunciator can emit two different acoustic signals, the transmitted signal is encoded dependent upon which acoustic signal …
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 May 6, 1996 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2018.
- 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.