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Official data from INPI

APARELHAGEM DE RELE DE COMPARACAO DE FASE PARA A PROTECAO DE UMA LINHA DE TRANSMISSAO DE FORCA EM CORRENTE ALTERNAD

ConcedidaInvention Patent

Application data

Number

PI7705487

Type

Invention Patent

Filing

08/20/1976

Publication

-

Progress at the INPI

  1. Filing08/20/76
  2. Publication
  3. Examination
  4. Allowance
  5. Grant11/30/82
  6. Expired07/13/93

The letters patent expired on 07/13/1993: 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: 11/30/1982. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

WESTINGHOUSE ELECTRIC CORP

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Inventors

G. R. (pessoa física)

H. W. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

11/30/1982

RPI 632

Notificação para pagamento de retribuição

#13.1

07/27/1982

RPI 614

110

05/11/1982

RPI 603

Recurso

#12.1

10/06/1981

RPI 572

Carta-patente expirada

#21.1

07/13/1993

RPI 1180

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