US2191502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicolor film and process
Assignee: DuPont Film Manufacturing Corp
•
Filing: 1937-01-22
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Granted: 1940-02-27
•
Expires: 1957-01-22
Abstract
No abstract record available.
Inventors
- 👤 Sease Virgil Bernard
- 👤 Weber John Rau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:05
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3029
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-02-26 | 1943-08-28 | 1944-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-26 | 1947-08-28 | 1948-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-26 | 1951-08-28 | 1952-02-27 | $7700.00 | Window Closed / Lapsed |