Official data from INPI

PROCESSO PARA A PRODUCAO DE FOSFATO MONOCALCICO E ACIDO FOSFORICO

ConcedidaInvention Patent

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Application data

Number

PI7903045

Type

Invention Patent

Filing

08/02/1978

Publication

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Progress at the INPI

Filing08/02/78
Publication
Examination03/23/82
Allowance08/09/83
Grant02/28/84
Expired07/26/94

The letters patent expired on 07/26/1994: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 02/28/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

PENNZOIL CO

Inventors

D. E. (pessoa física)

Technical data

IPC Classification

C01B 25/22 C01B 25/26 C01F 11/22 C01F 11/46 C05B 11/10 C05B 21/00 C05B 7/00

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

02/28/1984

RPI 697

Notificação para pagamento de retribuição

#13.1

11/29/1983

RPI 684

Deferimento

#9.1

08/09/1983

RPI 668

Solicitação de exame técnico

#4.1

03/23/1982

RPI 596

Carta-patente expirada

#21.1

07/26/1994

RPI 1234

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