US2696992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sketching and writing aid
Assignee: Individual
•
Filing: 1949-12-03
•
Granted: 1954-12-14
•
Expires: 1969-12-03
Abstract
No abstract record available.
Inventors
- 👤 John C M Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
B; B42; B42F; B42F13/00; B42F13/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US643164A
Cited
GB190320533A
Cited
US878080A
Cited
US1371459A
Cited
US1894559A
Cited
US2136186A
Cited
US2091667A
Cited
US2194003A
Cited
US2516239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |