Official data from INPI

TELEFONE DE EXTENSAO DE CANAL DE SERVICO

ConcedidaInvention Patent

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Application data

Number

PI7704592

Type

Invention Patent

Filing

07/13/1977

Publication

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Progress at the INPI

Filing07/13/77
Publication
Examination
Allowance04/19/83
Grant12/27/83
Expired07/06/93

The letters patent expired on 07/06/1993: 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: 12/27/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

T. J. (pessoa física)

Inventors

P. P. (pessoa física)

Technical data

IPC Classification

H04M 1/00

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

12/27/1983

RPI 688

Notificação para pagamento de retribuição

#13.1

09/06/1983

RPI 672

Deferimento

#9.1

04/19/1983

RPI 652

15.0

02/09/1982

RPI 590

Carta-patente expirada

#21.1

07/06/1993

RPI 1179

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