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Official data from INPI

ATENUADOR CONTROLADO POR VOLTAGEM E CELULA DE GANHO

Em AnáliseInvention Patent

Application data

Number

PI7900160

Type

Invention Patent

Filing

01/11/1978

Publication

-

Progress at the INPI

  1. Filing01/11/78
  2. Publication
  3. Examination
  4. Allowance06/01/82
  5. Grant02/22/83
  6. Expired05/31/94

The letters patent expired on 05/31/1994: 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: 06/04/1985. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

B. D. (pessoa física)

R. H. (pessoa física)

Inventors

B. D. (pessoa física)

R. H. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Cessão de direito de exploração

#22.1

06/04/1985

RPI 763

Concessão da patente

#16.1

02/22/1983

RPI 644

Notificação para pagamento de retribuição

#13.1

09/21/1982

RPI 622

Deferimento

#9.1

06/01/1982

RPI 606

Carta-patente expirada

#21.1

05/31/1994

RPI 1226

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