Expired Canadian patentCanada
Vented loudspeaker
CA 1301075 C · Owner: Rothenberg, Richard L. · Inventors: Rothenberg, Richard L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vented loudspeaker has a speaker and a vent tube within the loudspeaker enclosure, the vent tube being arranged obliquely to the wall on which it is mounted and being longer than the distance between that wall and the opposite wall.
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 May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 7, 1988
GrantedMay 19, 1992
Term endedMay 19, 2009
Patent numberCA 1301075 C
Classification (IPC)H04R1/02 +1 more
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.