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Official data from INPI

FLUIDO A BASE DE OLEO EM PARTICULAR FLUIDO DE RECHEIO A BASE DE OLEO PROCESSO PARA ISOLAR UM TUBO PARA REVESTIMENTO EM UMA PERFURACAO DE POCO E GELIFICANTE

ConcedidaInvention Patent

Application data

Number

PI8107427

Type

Invention Patent

Filing

10/19/1981

Publication

05/24/1983

Progress at the INPI

  1. Filing10/19/81
  2. Publication05/24/83
  3. Examination01/24/84
  4. Allowance10/27/87
  5. Grant05/31/88
  6. Terminated08/07/90

The patent was granted on 05/31/1988 and later terminated for failure to pay the annuities. The technology is in the public domain in Brazil.

Talk to a specialist

Latest action published by the INPI: 05/31/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

NL INDUSTRIES INC [US]

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Inventors

F. M. (pessoa física)

M. S. (pessoa física)

S. A. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

05/31/1988

RPI 919

Notificação para pagamento de retribuição

#13.1

03/01/1988

RPI 906

Deferimento

#9.1

10/27/1987

RPI 888

Exigência - art. 36 da LPI

#6.1

01/15/1985

RPI 743

Solicitação de exame técnico

#4.1

01/24/1984

RPI 692

Publicação do pedido de patente

#3.1

05/24/1983

RPI 657

Pedido de patente depositado

#2.1

12/29/1981

RPI 584

Anuidade - prazo legal encerrado

#18.2

08/07/1990

RPI 1027

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