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Official data from INPI

SISTEMA DE CONTROLE DE POÇO ELEVADOR MARINHO E PROCESSO PARA MANTER PRESSÃO SEGURA NO ESPAÇO ANULAR DE UM ELEVADOR DE PERFURAÇÃO MARINHO

Em ExigênciaInvention Patent

Application data

Number

PI8507003

Type

Invention Patent

Filing

09/24/1985

Publication

01/06/1987

Progress at the INPI

  1. Filing09/24/85
  2. Publication01/06/87
  3. Examination04/19/88
  4. Allowance01/23/90
  5. Grant08/28/90
  6. Expired07/15/08

The letters patent expired on 07/15/2008: 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: 07/25/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Hydril Company

US

See this company's full portfolio

Inventors

J. R. (pessoa física)

US

Technical data

Priority claims

US

663.235 · 10/22/1984

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Exigência - art. 36 da LPI

#6.1

07/25/1989

RPI 979

Solicitação de exame técnico

#4.1

04/19/1988

RPI 913

Notificação de entrada na fase nacional - PCT

#1.3

01/06/1987

RPI 846

Carta-patente expirada

#21.1

Patente extinta em 24/09/2000

07/15/2008

RPI 1958

Concessão da patente

#16.1

08/28/1990

RPI 1030

Notificação para pagamento de retribuição

#13.1

05/22/1990

RPI 1019

Deferimento

#9.1

01/23/1990

RPI 1003

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