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Official data from INPI

PROCESSO DE RECUPERACAO E PURIFICACAO DE ACRILONITRILA OU METACRILONITRILA

ConcedidaInvention Patent

Application data

Number

PI7804802

Type

Invention Patent

Filing

07/29/1977

Publication

-

Progress at the INPI

  1. Filing07/29/77
  2. Publication
  3. Examination
  4. Allowance06/14/83
  5. Grant01/31/84
  6. Expired11/30/93

The letters patent expired on 11/30/1993: 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: 01/31/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

STANDARD OIL CO

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Inventors

F. W. (pessoa física)

W. H. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

01/31/1984

RPI 693

Notificação para pagamento de retribuição

#13.1

10/04/1983

RPI 676

Deferimento

#9.1

06/14/1983

RPI 660

Exigência - art. 36 da LPI

#6.1

10/26/1982

RPI 627

6.2

10/13/1981

RPI 573

Carta-patente expirada

#21.1

11/30/1993

RPI 1200

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