Patent DE40779C successfully refreshed from Google Patents.
Patent US16942A successfully refreshed from Google Patents.
Patent US178184A successfully refreshed from Google Patents.
Patent FR1291983A successfully refreshed from Google Patents.
FR1291983A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improved sensitive photographic material, in white and black, capable of producing, by means of the formation of an auxiliary image, an effect equivalent to an increase in the original sensitivity
Assignee: Ferrania SpA
•
Filing: 1961-06-09
•
Granted: 1962-04-27
•
Expires: 1981-06-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-29 09:25
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.