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Official data from INPI

APARELHO E CONJUNTO DE TAMPÃO DE LIBERAÇÃO DE SUBSUPERFÍCIE

PublicadaInvention Patent

Application data

Number

PI8804529

Type

Invention Patent

Filing

09/02/1988

Publication

04/04/1989

Progress at the INPI

  1. Filing09/02/88
  2. Publication04/04/89
  3. Examination07/02/91
  4. Allowance08/02/94
  5. Grant01/31/95
  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: 04/04/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Halliburton Company

US

See this company's full portfolio

Inventors

B. B. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

093,430 · 09/04/1987

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

04/04/1989

RPI 963

Pedido de patente depositado

#2.1

01/31/1989

RPI 954

Carta-patente expirada

#21.1

Patente extinta em 02/09/2003

09/02/2008

RPI 1965

Concessão da patente

#16.1

01/31/1995

RPI 1261

Deferimento (variante)

#9.1.2

11/15/1994

RPI 1250

Deferimento

#9.1

08/02/1994

RPI 1235

Deferimento

#9.1

07/19/1994

RPI 1233

Exigência - art. 36 da LPI

#6.1

04/12/1994

RPI 1219

6.2

07/20/1993

RPI 1181

Solicitação de exame técnico

#4.1

07/02/1991

RPI 1074

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