US2509944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Undulating track roundabout
Assignee: Individual
•
Filing: 1946-08-23
•
Granted: 1950-05-30
•
Expires: 1966-08-23
Abstract
No abstract record available.
Inventors
- 👤 Jack J Skelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
A; A63; A63G; A63G1/00; A63G1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US127174A
Cited
US381187A
Cited
US1008547A
Cited
US1182682A
Cited
US1399582A
Cited
US1512972A
Cited
US1577809A
Cited
CH125250A
Cited
US1782728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |