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Official data from INPI

PROCESSO E APARELHO PARA DEMODULAR SINAIS EM UM SISTEMA DE PERFILAGEM SIMULTANEA COM PERFURACAO

ConcedidaInvention Patent

Application data

Number

PI7901224

Type

Invention Patent

Filing

02/27/1978

Publication

-

Progress at the INPI

  1. Filing02/27/78
  2. Publication
  3. Examination
  4. Allowance07/27/82
  5. Grant03/29/83
  6. Expired06/21/94

The letters patent expired on 06/21/1994: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

Talk to a specialist

Latest action published by the INPI: 03/29/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

SCHLUMBERGER TECHNOLOGY CORP

Inventors

S. G. (pessoa física)

W. W. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

03/29/1983

RPI 649

Notificação para pagamento de retribuição

#13.1

12/14/1982

RPI 634

Deferimento

#9.1

07/27/1982

RPI 614

Exigência - art. 36 da LPI

#6.1

02/24/1982

RPI 592

Carta-patente expirada

#21.1

06/21/1994

RPI 1229

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