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Official data from INPI

PROCESSO E APARELHO PARA VALVULA DE REVERSAO CONTROLADA POR PRESSAO

Em AnáliseInvention Patent

Application data

Number

PI7603097

Type

Invention Patent

Filing

05/21/1975

Publication

-

Progress at the INPI

  1. Filing05/21/75
  2. Publication
  3. Examination
  4. Allowance
  5. Grant12/29/81
  6. Expired08/03/93

The letters patent expired on 08/03/1993: 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: 11/06/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

SCHLUMBERGER TECHNOLOGY CORP

Inventors

N. B. (pessoa física)

Technical data

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Cessão de direito de exploração

#22.1

11/06/1984

RPI 733

Concessão da patente

#16.1

12/29/1981

RPI 584

Carta-patente expirada

#21.1

08/03/1993

RPI 1183

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