The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
Nov. 06, 1997
Filippo Faranda, Savona, IT;
Ferrania S.p.A., , IT;
Abstract
A black-and-white aqueous alkaline photographic developer composition is described which is free of dihydroxybenzene developing agent and comprises a p-aminophenol primary developing agent and an auxiliary superadditive 3-pyrazolidone developing agent, wherein the p-aminophenol primary developing agent is represented by the following formula: ##STR1## wherein R.sub.1, and R.sub.2, which may be the same or different, each represents a hydrogen atom, an alkyl group, or R.sub.1, and R.sub.2 together represent the carbon atoms required to complete a 5-membered saturated ring, R.sub.3 represents a hydrogen atom, an alkyl group or an alkoxy group, n represents 0 or 1, and HX represents HCl or 1/2 H.sub.2 SO.sub.4. A process for forming a black-and-white photographic silver image comprising developing a silver halide photographic element with the black-and-white aqueous alkaline photographic developer composition is also described.