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Official data from INPI

PROCESSO PARA A PREPARACAO DE METIL-TERCIO-BUTILETER

ConcedidaInvention Patent

Application data

Number

PI7704322

Type

Invention Patent

Filing

07/02/1976

Publication

-

Progress at the INPI

  1. Filing07/02/76
  2. Publication
  3. Examination
  4. Allowance03/01/83
  5. Grant08/30/83
  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: 08/30/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

HUELS CHEMISCHE WERKE AG

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Inventors

D. W. (pessoa física)

M. W. (pessoa física)

O. F. (pessoa física)

S. W. (pessoa física)

Z. M. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

08/30/1983

RPI 671

Notificação para pagamento de retribuição

#13.1

06/21/1983

RPI 661

Deferimento

#9.1

03/01/1983

RPI 645

Arquivamento - Art. 36 §1° da LPI

#11.2

05/18/1982

RPI 604

15.0

11/17/1981

RPI 578

Carta-patente expirada

#21.1

07/06/1993

RPI 1179

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