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Official data from INPI

PROCESSO PARA A CIMENTAÇÃO A CARBONO DE PEÇAS A TRABALHAR NA CÂMARA DE TRABALHO DE UM FORNO DE VESTÍBULO.

Em AnáliseInvention Patent
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Application data

Number

PI7701518

Type

Invention Patent

Filing

03/11/1977

Publication

-
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Progress at the INPI

  1. Filing03/11/77
  2. Publication
  3. Examination
  4. Allowance
  5. Grant07/27/82
  6. Expired07/27/93

The letters patent expired on 07/27/1993: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 11/12/1985. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

AIRCO INC

Inventors

B. R. (pessoa física)

Technical data

IPC Classification

No IPC classification.

Priority claims

US

P: 665.844 · 03/11/1976

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.4

11/12/1985

RPI 786

Concessão da patente

#16.1

07/27/1982

RPI 614

Notificação para pagamento de retribuição

#13.1

11/10/1981

RPI 577

Carta-patente expirada

#21.1

07/27/1993

RPI 1182

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