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Official data from INPI

VÁLVULA PILOTO PARA CONTROLAR A ABERTURA E O FECHAMENTO DE UMA VÁLVULA PRINCIPAL

Em AnáliseInvention Patent

Application data

Number

PI8706030

Type

Invention Patent

Filing

01/13/1987

Publication

02/23/1988

Progress at the INPI

  1. Filing01/13/87
  2. Publication02/23/88
  3. Examination07/12/88
  4. Allowance06/02/92
  5. Grant01/26/93
  6. Expired07/29/08

The letters patent expired on 07/29/2008: 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: 07/12/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Dresser Industries, Inc

US

See this company's full portfolio

Inventors

R. K. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

832.042 · 02/19/1986

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Solicitação de exame técnico

#4.1

07/12/1988

RPI 925

Notificação de entrada na fase nacional - PCT

#1.3

02/23/1988

RPI 905

Carta-patente expirada

#21.1

Patente extinta em 13/01/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

01/26/1993

RPI 1156

Notificação para pagamento de retribuição

#13.1

10/20/1992

RPI 1142

Deferimento

#9.1

06/02/1992

RPI 1122

14.1

09/25/1990

RPI 1034

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