(11) 98705-3426
TrademarkIQ iconTrademarkIQ
Back to search
Official data from INPI

SEM TITULO

Em AnáliseInvention Patent

Application data

Number

PI7406338

Type

Invention Patent

Filing

08/02/1974

Publication

-

Progress at the INPI

  1. Filing08/02/74
  2. Publication
  3. Examination
  4. Allowance
  5. Grant10/20/81
  6. Expired11/17/92

The letters patent expired on 11/17/1992: 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: 07/28/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

NL Chemicals, Inc.

US

Inventors

E. B. (pessoa física)

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

20.7

07/28/1987

RPI 875

Pedido de licença compulsória

#20.1

01/13/1987

RPI 847

Concessão da patente

#16.1

10/20/1981

RPI 574

Republicação - classificação IPC

#15.11

Procedimento automático de reclassificação. As classificações IPC anteriores eram: C01B 25/163; C01G 9/00; C09D 7/12.

03/27/2018

RPI 2464

Carta-patente expirada

#21.1

11/17/1992

RPI 1146

Patent monitoring

Track this patent in real time.

Receive alerts on INPI events, decisions, and expiry dates for your portfolio.