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Official data from INPI

ÉSTERES DE ANIDRIDO SUCCÍNICO E PROCESSO PARA PREPARAR OS MESMOS

ConcedidaInvention Patent

Application data

Number

PI7707188

Type

Invention Patent

Filing

10/26/1977

Publication

-

Progress at the INPI

  1. Filing10/26/77
  2. Publication
  3. Examination
  4. Allowance04/19/83
  5. Grant09/27/83
  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: 09/27/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Shell Internationale Research Maatschappij B.V

NL

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Inventors

D. N. (pessoa física)

NL

H. V. (pessoa física)

NL

Technical data

IPC Classification

Priority claims

GB

44859/76 · 10/28/1976

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

09/27/1983

RPI 675

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

09/28/1982

RPI 623

6.2

12/29/1981

RPI 584

Carta-patente expirada

#21.1

07/06/1993

RPI 1179

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