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Official data from INPI

ELETRETO DE TELA FIBROSA,APARELHO FILTRO,RESPIRADOR E PROCESSO DE FORMACAO DO ELETRETO

ConcedidaInvention Patent

Application data

Number

PI7900546

Type

Invention Patent

Filing

02/06/1978

Publication

-

Progress at the INPI

  1. Filing02/06/78
  2. Publication
  3. Examination
  4. Allowance
  5. Grant03/29/83
  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: 03/29/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

MINNESOTA MINING & MFG

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Inventors

D. C. (pessoa física)

K. D. (pessoa física)

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

03/29/1983

RPI 649

Notificação para pagamento de retribuição

#13.1

01/25/1983

RPI 640

Exigência - art. 36 da LPI

#6.1

03/30/1982

RPI 597

Carta-patente expirada

#21.1

05/31/1994

RPI 1226

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