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Expired Canadian patentCanada

Speaker adapted to corner-loaded installation

CA 1249971 A · Owner: Prophit, David A. · Inventors: Prophit, David A.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A limited space, small enclosure bass speaker module is shown for, providing an enchanced perception and sound level of bass frequencies. An acoustic transducer is mounted on an end of a closed elongated cylindrical, member of rigid construction. The cylinder provides acoustic loading of the transducer, and can be either an acoustic suspension or a bass reflex form; the bass reflex form has the bass reflex port located coplanar to the transducer. The resulting structure is an oriented point source. The module is then acoustically coupled to its surroundings by being mounted so that the transducer face is in a corner. The result is to convert the surrounding environment into one element of a …

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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 February 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 14, 1986
GrantedFebruary 14, 1989
Term endedFebruary 14, 2006
Patent numberCA 1249971 A
Classification (IPC)H05K5/00 +1 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedMarch 14, 1986Patent grantedFeb 14, 1989Term endedFeb 14, 2006

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.