Pedido de patente depositado
#2.1
11/28/1989
RPI 997
Application data
Number
PI8904422Type
Filing
Publication
The letters patent expired on 12/26/2012: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.
Talk to a specialistLatest action published by the INPI: 11/28/1989. We update with every new RPI gazette, published weekly.
Applicants
Q Sound Ltd.
CA
Inventors
D. L. (pessoa física)
CA
J. L. (pessoa física)
CA
IPC Classification
Priority claims
US
239,981 · 09/02/1988
US
398,988 · 08/28/1989
Publications in the Brazilian Industrial Property Gazette (RPI).
#2.1
11/28/1989
RPI 997
#21.1
Patente extinta em 01/09/2009
12/26/2012
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