US2902926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for duplicating
Assignee: Individual
•
Filing: 1956-10-30
•
Granted: 1959-09-08
•
Expires: 1976-10-30
Abstract
No abstract record available.
Inventors
- 👤 Ritzerfeld Wilhelm
- 👤 Ritzerfeld Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:54
CPC Classifications
B; B41; B41F; B41F7/00; B41F7/20; B41F7/24; B41F7/26; B41M; B41M1/00; B41M1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733654A
Cited
US1535567A
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US2102641A
Cited
US2103254A
Cited
US2238058A
Cited
US2622521A
Cited
GB665047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |