Patent US2840472A successfully refreshed from Google Patents.
US2840472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive material to be used in diazo printing
Assignee: Keuffel and Esser Co
•
Filing: 1956-03-13
•
Granted: 1958-06-24
•
Expires: 1976-03-13
Abstract
No abstract record available.
Inventors
- 👤 Sus Oskar
- 👤 Werner Georg
- 👤 Wettlauffer Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54; Y; Y10; Y10S; Y10S62/00; Y10S62/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
PHOTOPRINTING MATERIAL COMPRISING A LIGHT SENSITIVE DIAZO COMPOUND ACCORDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
14 words
PHOTOPRINTING MATERIAL COMPRISING A LIGHT SENSITIVE DIAZO COMPOUND ACCORDING TO THE FOLLOWING GENERAL FORMULA
References Cited (Backward Citations)
US2298444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |