Official data from INPI

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Em AnáliseInvention Patent

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Application data

Number

PI7407651

Type

Invention Patent

Filing

09/13/1974

Publication

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Progress at the INPI

Filing09/13/74
Publication
Examination
Allowance
Grant03/30/82
Expired11/24/92

The letters patent expired on 11/24/1992: 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: 10/17/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Tenneco Chemicals Inc.

Inventors

E. B. (pessoa física)

Technical data

IPC Classification

C01G 3/04 C01G 5/00 C01G 7/00

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.5

10/17/1989

RPI 991

Concessão da patente

#16.1

03/30/1982

RPI 597

Carta-patente expirada

#21.1

11/24/1992

RPI 1147

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