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Official data from INPI

ESTRUTURA FILTRANTE POROSA, MOLDADA NUMA CONFIGURAÇÃO SIMILAR A PAINEL, E, RESPIRADOR PARA A FILTRAÇÃO DE GASES E VAPORES

Em AnáliseInvention Patent

Application data

Number

PI8603896

Type

Invention Patent

Filing

08/15/1986

Publication

03/24/1987

Progress at the INPI

  1. Filing08/15/86
  2. Publication03/24/87
  3. Examination03/21/89
  4. Allowance11/21/95
  5. Grant07/30/96
  6. Expired07/22/08

The letters patent expired on 07/22/2008: 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: 03/21/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Minnesota Mining and Manufacturing Company

US

See this company's full portfolio

Inventors

D. B. (pessoa física)

US

P. R. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

770.075 · 08/28/1985

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Solicitação de exame técnico

#4.1

03/21/1989

RPI 961

Publicação do pedido de patente

#3.1

03/24/1987

RPI 857

Pedido de patente depositado

#2.1

01/06/1987

RPI 846

Carta-patente expirada

#21.1

Patente extinta em 15/08/2001

07/22/2008

RPI 1959

Concessão da patente

#16.1

07/30/1996

RPI 1339

Republicação - classificação IPC

#15.11

12/19/1995

RPI 1307

Deferimento

#9.1

11/21/1995

RPI 1303

Exigência - art. 36 da LPI

#6.1

10/25/1994

RPI 1247

Conhecimento de parecer técnico

#7.1

05/11/1993

RPI 1171

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