Patent US548357A successfully refreshed from Google Patents.
US2770902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-automatic perpetual calendar
Assignee: Individual
•
Filing: 1955-01-24
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Granted: 1956-11-20
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Expires: 1975-01-24
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Karl Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:05
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/04; G09D3/06
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |