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Official data from INPI

PROCESSO PARA INIBIR A FORMAÇÃO DE INCRUSTAÇÕES EM POÇOS DE PETRÓLEO.

ConcedidaInvention Patent

Application data

Number

PI7900904

Type

Invention Patent

Filing

06/01/1979

Publication

-

Progress at the INPI

  1. Filing06/01/79
  2. Publication
  3. Examination02/24/82
  4. Allowance04/19/83
  5. Grant11/29/83
  6. Expired05/31/94

The letters patent expired on 05/31/1994: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 11/29/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Petróleo Brasileiro S/A - Petrobrás

RJ, BR

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Inventors

Z. M. (pessoa física)

Technical data

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

11/29/1983

RPI 684

Notificação para pagamento de retribuição

#13.1

09/06/1983

RPI 672

Deferimento

#9.1

04/19/1983

RPI 652

Exigência - art. 36 da LPI

#6.1

09/14/1982

RPI 621

Solicitação de exame técnico

#4.1

02/24/1982

RPI 592

Carta-patente expirada

#21.1

05/31/1994

RPI 1226

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