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Official data from INPI

PROCESSO PARA APERFEICOAMENTO NA FORMACAO DE ALUMINA HIDRATADA, DISPERSA EM UMA RESINA DE TROCA ANIONICA DE BASE FRACA

ConcedidaInvention Patent

Application data

Number

PI8007372

Type

Invention Patent

Filing

11/19/1979

Publication

-

Progress at the INPI

  1. Filing11/19/79
  2. Publication
  3. Examination08/02/83
  4. Allowance02/04/86
  5. Grant11/25/86
  6. Expired12/26/95

The letters patent expired on 12/26/1995: 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: 05/31/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

The Dow Chemcial Company

US

See this company's full portfolio

Inventors

D. W. (pessoa física)

L. J. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Republicação - classificação IPC

#15.11

05/31/1988

RPI 919

Concessão da patente

#16.1

11/25/1986

RPI 840

Notificação para pagamento de retribuição

#13.1

06/24/1986

RPI 818

Deferimento

#9.1

02/04/1986

RPI 798

Exigência - art. 36 da LPI

#6.1

02/12/1985

RPI 747

Solicitação de exame técnico

#4.1

08/02/1983

RPI 667

Carta-patente expirada

#21.1

12/26/1995

RPI 1308

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