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US2774160A
Expired / Lapsed
US
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Perpetual calendars
Assignee: Individual
•
Filing: 1955-02-14
•
Granted: 1956-12-18
•
Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Gilson Robert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:57
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/04; G09D3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1607703A
Cited
US2146981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |