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Official data from INPI

APERFEICOAMENTOS EM QUEIMADOR DE OLEO E PROCESSO PARA SUA OPERACAO

ConcedidaInvention Patent

Application data

Number

PI7604841

Type

Invention Patent

Filing

08/01/1975

Publication

-

Progress at the INPI

  1. Filing08/01/75
  2. Publication
  3. Examination
  4. Allowance
  5. Grant07/27/82
  6. Expired07/20/93

The letters patent expired on 07/20/1993: 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: 07/27/1982. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

NICHOLS ENG & RES CORP

Inventors

L. E. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

07/27/1982

RPI 614

Notificação para pagamento de retribuição

#13.1

01/12/1982

RPI 586

Carta-patente expirada

#21.1

07/20/1993

RPI 1181

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