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Official data from INPI

POLIA DUPLA REGULAVEL

Em AnáliseInvention Patent

Application data

Number

PI7701628

Type

Invention Patent

Filing

03/17/1977

Publication

-

Progress at the INPI

  1. Filing03/17/77
  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.

Talk to a specialist

Latest action published by the INPI: 09/20/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

HITACHI LINE IND ELETRICA SA

Inventors

O. M. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.7

09/20/1983

RPI 674

20.4

09/13/1983

RPI 673

Concessão da patente

#16.1

07/27/1982

RPI 614

Notificação para pagamento de retribuição

#13.1

10/06/1981

RPI 572

Carta-patente expirada

#21.1

07/27/1993

RPI 1182

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