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Official data from INPI

Processo para a preparação de sílica gel e de sílica xerogel, e sílica xerogel com densidade regular e com densidade intermediária.

ConcedidaInvention Patent

Application data

Number

PI8005382

Type

Invention Patent

Filing

08/26/1980

Publication

-

Progress at the INPI

  1. Filing08/26/80
  2. Publication
  3. Examination08/09/83
  4. Allowance06/11/85
  5. Grant12/31/85
  6. Terminated09/25/90

The patent was granted on 12/31/1985 and later terminated for failure to pay the annuities. The technology is in the public domain in Brazil.

Talk to a specialist

Latest action published by the INPI: 12/31/1985. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

W.R. Grace & Co.

US

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Inventors

D. C. (pessoa física)

W. M. (pessoa física)

Technical data

IPC Classification

Priority claims

US

80.485 · 10/01/1979

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

12/31/1985

RPI 793

Notificação para pagamento de retribuição

#13.1

09/24/1985

RPI 779

Deferimento

#9.1

06/11/1985

RPI 764

Exigência - art. 36 da LPI

#6.1

09/04/1984

RPI 724

Exigência - art. 36 da LPI

#6.1

02/28/1984

RPI 697

Solicitação de exame técnico

#4.1

08/09/1983

RPI 668

Anuidade - prazo legal encerrado

#18.2

09/25/1990

RPI 1034

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