US2297691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotography
Assignee: Individual
•
Filing: 1939-04-04
•
Granted: 1942-10-06
•
Expires: 1959-04-04
Abstract
No abstract record available.
Inventors
- 👤 Chester F Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G15/00; G03G15/22; G03G15/26; G03G15/266; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207; Y; Y10; Y10S; Y10S101/00; Y10S101/37
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) | 1945-10-05 | 1946-04-06 | 1946-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-05 | 1950-04-06 | 1950-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-05 | 1954-04-06 | 1954-10-06 | $7700.00 | Window Closed / Lapsed |