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Official data from INPI

ESTRUTURA DE CABEÇOTE DE POÇO E PROCESSO DE PRODUZIR UMA VEDAÇÃO ANULAR DE CABEÇOTE DE POÇO

PublicadaInvention Patent

Application data

Number

PI8801843

Type

Invention Patent

Filing

04/19/1988

Publication

11/22/1988

Progress at the INPI

  1. Filing04/19/88
  2. Publication11/22/88
  3. Examination01/29/91
  4. Allowance01/18/94
  5. Grant08/30/94
  6. Terminated12/31/96

The patent was granted on 08/30/1994 and later terminated for failure to pay the annuities. The technology is in the public domain in Brazil.

Talk to a specialist

Latest action published by the INPI: 11/22/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Cameron Iron Works USA, Inc

US

See this company's full portfolio

Inventors

W. T. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

044.581 · 04/30/1987

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

11/22/1988

RPI 944

Pedido de patente depositado

#2.1

09/20/1988

RPI 935

Anuidade - prazo legal encerrado

#18.2

12/31/1996

RPI 1361

Concessão da patente

#16.1

08/30/1994

RPI 1239

Notificação para pagamento de retribuição

#13.1

05/10/1994

RPI 1223

Deferimento

#9.1

01/18/1994

RPI 1207

6.2

03/16/1993

RPI 1163

Solicitação de exame técnico

#4.1

01/29/1991

RPI 1052

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