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Official data from INPI

TIJOLO REFRATÁRIO DE CROMO-ALUMINA E COMPOSIÇÃO REFRATÁRIA

PublicadaInvention Patent

Application data

Number

PI8804996

Type

Invention Patent

Filing

09/27/1988

Publication

05/02/1989

Progress at the INPI

  1. Filing09/27/88
  2. Publication05/02/89
  3. Examination02/13/90
  4. Allowance09/05/95
  5. Grant04/30/96
  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: 05/02/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Dresser Industries, Inc

US

See this company's full portfolio

Inventors

D. W. (pessoa física)

US

S. P. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

103.114 · 09/30/1987

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

05/02/1989

RPI 967

Pedido de patente depositado

#2.1

02/08/1989

RPI 955

Carta-patente expirada

#21.1

Patente extinta em 27/09/2003

09/02/2008

RPI 1965

Concessão da patente

#16.1

04/30/1996

RPI 1326

Republicação - classificação IPC

#15.11

09/26/1995

RPI 1295

Deferimento

#9.1

09/05/1995

RPI 1292

Solicitação de exame técnico

#4.1

02/13/1990

RPI 1006

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