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Official data from INPI

PROCESSO PARA OBTENÇÃO DE ELASTÔMEROS DE POLIURETANA PREPARADOS DE PRÉ-POLÍMEROS DE ALTO PESO MOLECULAR E SOLUÇÃO DE QUASE-PRÉPOLÍMERO.

PublicadaInvention Patent

Application data

Number

PI8606477

Type

Invention Patent

Filing

12/29/1986

Publication

10/20/1987

Progress at the INPI

  1. Filing12/29/86
  2. Publication10/20/87
  3. Examination06/19/90
  4. Allowance08/31/93
  5. Grant04/26/94
  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: 10/20/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

The Dow Chemical Company

US

See this company's full portfolio

Inventors

D. J. (pessoa física)

US

R. P. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

813.893 · 12/27/1985

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

10/20/1987

RPI 887

Pedido de patente depositado

#2.1

04/28/1987

RPI 862

Carta-patente expirada

#21.1

Patente extinta em 29/12/2001

07/22/2008

RPI 1959

Concessão da patente

#16.1

04/26/1994

RPI 1221

Deferimento

#9.1

08/31/1993

RPI 1187

Exigência - art. 36 da LPI

#6.1

10/20/1992

RPI 1142

Solicitação de exame técnico

#4.1

06/19/1990

RPI 1023

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