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Official data from INPI

PROCESSO PARA CONTROLAR A CORROSAO CAUSADA POR COMPONENTES ACIDOS NO CONDENSADO INICIAL DE UM PRODUTO DE DESTILACAO DE PETROLEO EM UMA UNIDADE DE REFINACAO

Em AnáliseInvention Patent

Application data

Number

PI7703538

Type

Invention Patent

Filing

07/28/1976

Publication

-

Progress at the INPI

  1. Filing07/28/76
  2. Publication
  3. Examination
  4. Allowance01/26/82
  5. Grant
  6. Expired07/06/93

The letters patent expired on 07/06/1993: 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: 03/31/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

NALCO CHEMICAL CO

Inventors

No inventors listed.

Technical data

IPC Classification

No IPC classification.

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.7

03/31/1987

RPI 858

Cessão de direito de exploração

#22.1

08/19/1986

RPI 826

Notificação para pagamento de retribuição

#13.1

06/01/1982

RPI 606

Deferimento

#9.1

01/26/1982

RPI 588

Carta-patente expirada

#21.1

07/06/1993

RPI 1179

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