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Official data from INPI

PROCESSO DE INTRODUZIR GRUPOS ÁCIDO ACRILAMIDO METANO SULFÔNICO EM POLÍMEROS DE ÁCIDO ACRÍLICO OU ÁCIDO METACRÍLICO

PublicadaInvention Patent

Application data

Number

PI8805499

Type

Invention Patent

Filing

10/25/1988

Publication

07/04/1989

Progress at the INPI

  1. Filing10/25/88
  2. Publication07/04/89
  3. Examination08/20/91
  4. Allowance08/01/95
  5. Grant03/26/96
  6. Expired09/02/08

The letters patent expired on 09/02/2008: 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: 07/04/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Nalco Chemical Company

US

See this company's full portfolio

Inventors

D. F. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

112,643 · 10/26/1987

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

07/04/1989

RPI 976

Pedido de patente depositado

#2.1

04/04/1989

RPI 963

Carta-patente expirada

#21.1

Patente extinta em 25/10/2003

09/02/2008

RPI 1965

Concessão da patente

#16.1

03/26/1996

RPI 1321

Deferimento

#9.1

08/01/1995

RPI 1287

Exigência - art. 36 da LPI

#6.1

01/17/1995

RPI 1259

Solicitação de exame técnico

#4.1

08/20/1991

RPI 1081

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