US3520691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-developable diazotype material
Assignee: Keuffel and Esser Co
•
Filing: 1967-03-15
•
Granted: 1970-07-14
•
Expires: 1987-03-15
Abstract
No abstract record available.
Inventors
- 👤 Siegfried Scheler
- 👤 Johannes Munder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3046128A
Cited
US3076707A
Cited
GB907724A
Cited
US3284201A
Cited
US3199982A
Cited
NL6404649A
Cited
US3434838A
Cited
US3416924A
Cited
FR1418156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |