US2933813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ellipsographs
Assignee: Individual
•
Filing: 1953-02-16
•
Granted: 1960-04-26
•
Expires: 1973-02-16
Abstract
No abstract record available.
Inventors
- 👤 Albert V T Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:32
CPC Classifications
B; B43; B43L; B43L11/00; B43L11/02; B43L11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |