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Official data from INPI

APARELHO PARA CONTROLAR NÍVEL DE LÍQUIDO E PROCESSO PARA CONTROLAR O NÍVEL DE UM LÍQUIDO

PublicadaInvention Patent

Application data

Number

PI8601775

Type

Invention Patent

Filing

04/18/1986

Publication

11/10/1987

Progress at the INPI

  1. Filing04/18/86
  2. Publication11/10/87
  3. Examination06/26/90
  4. Allowance06/02/92
  5. Grant01/26/93
  6. Expired07/22/08

The letters patent expired on 07/22/2008: 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: 11/10/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Aluminum Company Of America

US

See this company's full portfolio

Inventors

D. K. (pessoa física)

US

D. C. (pessoa física)

US

M. W. (pessoa física)

US

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

11/10/1987

RPI 890

Pedido de patente depositado

#2.1

10/29/1986

RPI 836

Carta-patente expirada

#21.1

Patente extinta em 18/04/2001

07/22/2008

RPI 1959

Concessão da patente

#16.1

01/26/1993

RPI 1156

Notificação para pagamento de retribuição

#13.1

10/20/1992

RPI 1142

Deferimento

#9.1

06/02/1992

RPI 1122

Exigência - art. 36 da LPI

#6.1

11/12/1991

RPI 1093

Solicitação de exame técnico

#4.1

06/26/1990

RPI 1024

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