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Official data from INPI

PROCESSO DE FLOTAÇÃO COM ESPUMA PARA CARVÃO EM BRUTO

Arquivada/ExtintaInvention PatentPCT · US1989001612

Application data

Number

PI8906937

Type

Invention Patent

Filing

04/17/1989

Publication

09/11/1990

PCT

US1989001612

Progress at the INPI

  1. Filing04/17/89
  2. Publication09/11/90
  3. Examination01/28/92
  4. Allowance04/14/98
  5. Grant11/24/98
  6. Expired12/26/12

The letters patent expired on 12/26/2012: 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: 12/26/2012. 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

M. F. (pessoa física)

US

R. K. (pessoa física)

US

R. H. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

187,115 · 04/28/1988

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Carta-patente expirada

#21.1

Patente extinta em 17/04/2009

12/26/2012

RPI 2190

Concessão da patente

#16.1

11/24/1998

RPI 1455

Deferimento

#9.1

04/14/1998

RPI 1425

Exigência - art. 36 da LPI

#6.1

10/07/1997

RPI 1401

Exigência - art. 36 da LPI

#6.1

01/21/1997

RPI 1364

Solicitação de exame técnico

#4.1

01/28/1992

RPI 1104

Notificação de entrada na fase nacional - PCT

#1.3

09/11/1990

RPI 1032

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