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Official data from INPI

PROCESSO PARA PRODUZIR CARBON BLACK

Em AnáliseInvention Patent

Application data

Number

PI7501111

Type

Invention Patent

Filing

02/25/1974

Publication

-

Progress at the INPI

  1. Filing02/25/74
  2. Publication
  3. Examination
  4. Allowance
  5. Grant12/29/81
  6. Expired08/03/93

The letters patent expired on 08/03/1993: 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: 08/01/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

CABOT CORP

Inventors

A. M. (pessoa física)

M. J. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.7

08/01/1989

RPI 980

Concessão da patente

#16.1

12/29/1981

RPI 584

Carta-patente expirada

#21.1

08/03/1993

RPI 1183

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