Official data from INPI

SISTEMA DE CONTOLE DE CHAVEAMENTO DE VOZ

ConcedidaInvention Patent

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Application data

Number

PI7908973

Type

Invention Patent

Filing

05/11/1979

Publication

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Progress at the INPI

Filing05/11/79
Publication
Examination06/08/82
Allowance08/30/83
Grant03/27/84
Expired05/09/95

The letters patent expired on 05/09/1995: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 03/27/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

TOA ELECTRIC CO LTD

Inventors

S. S. (pessoa física)

Technical data

IPC Classification

H04M 9/00 H04M 9/10

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

03/27/1984

RPI 701

Notificação para pagamento de retribuição

#13.1

12/20/1983

RPI 687

Deferimento

#9.1

08/30/1983

RPI 671

Conhecimento de parecer técnico

#7.1

03/15/1983

RPI 647

Solicitação de exame técnico

#4.1

06/08/1982

RPI 607

Carta-patente expirada

#21.1

05/09/1995

RPI 1275

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