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US2647270A
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Assignee: Individual
•
Filing: 1949-01-07
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Granted: 1953-08-04
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Expires: 1969-01-07
Abstract
No abstract record available.
Inventors
- 👤 Lester P Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:18
CPC Classifications
E; E01; E01D; E01D15/00; E01D15/12; E01D15/133; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32319; Y10T403/32327
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320079A
Cited
US1448854A
Cited
US1467696A
Cited
US1887252A
Cited
US1941348A
Cited
US2171326A
Cited
US2291014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |