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Official data from INPI

PROCESSO PARA PRODUZIR ÁCIDOS CARBOXÍLICOS ALIFÁTICOS FOSFÍNICO-SUBSTITUÍDOS, ÁCIDOS ASSIM PRODUZIDOS, E PROCESSO PARA TRATAR ÁGUA CONTENDO DUREZA PARA PREVENIR A FORMAÇÃO DE CROSTAS

ConcedidaInvention Patent

Application data

Number

PI7703515

Type

Invention Patent

Filing

05/31/1977

Publication

-

Progress at the INPI

  1. Filing05/31/77
  2. Publication
  3. Examination
  4. Allowance07/19/83
  5. Grant12/27/83
  6. Expired08/19/08

The letters patent expired on 08/19/2008: 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: 12/27/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

NALCO CHEMICAL COMPANY

US

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Inventors

J. M. (pessoa física)

US

M. S. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

701.785 · 07/01/1976

US

711.010 · 08/02/1976

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

12/27/1983

RPI 688

Notificação para pagamento de retribuição

#13.1

11/16/1983

RPI 682

Deferimento

#9.1

07/19/1983

RPI 665

Conhecimento de parecer técnico

#7.1

12/14/1982

RPI 634

Exigência - art. 36 da LPI

#6.1

01/05/1982

RPI 585

Carta-patente expirada

#21.1

Patente extinta em 31/05/92

08/19/2008

RPI 1963

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