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Official data from INPI

AGENTE DE SUPORTE, DE ALTA RESISTÊNCIA, PARA USO EM FRATURAÇÃO HIDRÁULICA DE FORMAÇÕES SUBTERRÂNEAS, E PROCESSO DE FRATURAÇÃO HIDRÁULICA USANDO O MESMO

ConcedidaInvention Patent

Application data

Number

PI8300045

Type

Invention Patent

Filing

01/06/1983

Publication

09/13/1983

Progress at the INPI

  1. Filing01/06/83
  2. Publication09/13/83
  3. Examination12/03/85
  4. Allowance01/31/89
  5. Grant08/29/89
  6. Terminated04/18/95

The patent was granted on 08/29/1989 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: 08/29/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Dresser Industries, Inc.

US

See this company's full portfolio

Inventors

E. L. (pessoa física)

US

Technical data

IPC Classification

Priority claims

DK

36/82 · 01/07/1982

US

437.206 · 10/28/1982

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

08/29/1989

RPI 984

Notificação para pagamento de retribuição

#13.1

06/06/1989

RPI 972

Republicação - classificação IPC

#15.11

05/02/1989

RPI 967

Deferimento

#9.1

01/31/1989

RPI 954

Solicitação de exame técnico

#4.1

12/03/1985

RPI 789

Publicação do pedido de patente

#3.1

09/13/1983

RPI 673

Pedido de patente depositado

#2.1

02/22/1983

RPI 644

Anuidade - prazo legal encerrado

#18.2

04/18/1995

RPI 1272

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