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Official data from INPI

COMPOSICAO APERFEICOADA RETARDADORA DO TEMPO DE PEGA PARA A CIMENTACAO E RECIMENTACAO DE POCOS

ConcedidaInvention Patent

Application data

Number

PI7704814

Type

Invention Patent

Filing

07/26/1976

Publication

-

Progress at the INPI

  1. Filing07/26/76
  2. Publication
  3. Examination
  4. Allowance01/13/87
  5. Grant08/25/87
  6. Expired09/21/93

The letters patent expired on 09/21/1993: 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: 08/25/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

M. P. (pessoa física)

Inventors

O. R. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

08/25/1987

RPI 879

Notificação para pagamento de retribuição

#13.1

06/09/1987

RPI 868

Deferimento

#9.1

01/13/1987

RPI 847

Exigência - art. 36 da LPI

#6.1

01/19/1982

RPI 587

Carta-patente expirada

#21.1

09/21/1993

RPI 1190

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