Patent US2729020A successfully refreshed from Google Patents.
US2729020A
Expired / Lapsed
US
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Marble runway device
Assignee: Individual
•
Filing: 1951-04-12
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Granted: 1956-01-03
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Expires: 1971-04-12
Abstract
No abstract record available.
Inventors
- 👤 William L Frampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
A; A63; A63F; A63F7/00; A63F7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US741903A
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FR364721A
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US867652A
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US1687315A
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US1769327A
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US1972206A
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US2339074A
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US2416959A
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US2466573A
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US2540502A
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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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |