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US2660237A
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Assignee: Individual
•
Filing: 1951-08-02
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Granted: 1953-11-24
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Expires: 1971-08-02
Abstract
No abstract record available.
Inventors
- 👤 Bopp Frederick William
- 👤 Bopp Edward Otto
- 👤 Ernest F Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:18
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/36; E06B9/368; E06B9/362; E06B9/365; Y; Y10; Y10S; Y10S160/00; Y10S160/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1565735A
Cited
CH180251A
Cited
US2568324A
Cited
US2552406A
Cited
US2611426A
Cited
US2625219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |