US2796828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary duplicators
Assignee: Individual
•
Filing: 1953-01-21
•
Granted: 1957-06-25
•
Expires: 1973-01-21
Abstract
No abstract record available.
Inventors
- 👤 Ritzerfeld Wilhelm
- 👤 Ritzerfeld Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:46
CPC Classifications
B; B41; B41L; B41L11/00; B41P; B41P2700/00; B41P2700/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2306499A
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US2612104A
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US1750399A
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US1556782A
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US1738422A
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US1644144A
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US1798328A
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US1991511A
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US1868997A
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US2116609A
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GB700125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |