Patent US2621929A successfully refreshed from Google Patents.
US2621929A
Expired / Lapsed
US
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Vertically undulating platform roundabout
Assignee: Individual
•
Filing: 1950-11-27
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Granted: 1952-12-16
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Expires: 1970-11-27
Abstract
No abstract record available.
Inventors
- 👤 Jackson Herbert Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:25
CPC Classifications
A; A63; A63G; A63G1/00; A63G1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |