Patent US8641715B2 successfully refreshed from Google Patents.
US2447273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
patrick
Assignee: —
•
Filing: —
•
Granted: 1948-08-17
•
Expires: 1965-08-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:38
CPC Classifications
A; A63; A63H; A63H19/00; A63H19/30; A63H19/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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Cited
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Cited
US2112072A
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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) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |