US2639144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure and operating means therefor
Assignee: Struthers Wells Corp
•
Filing: 1948-06-15
•
Granted: 1953-05-19
•
Expires: 1968-06-15
Abstract
No abstract record available.
Inventors
- 👤 Charles A Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:57
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324667A
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US1127278A
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US1230316A
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US1207006A
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US1663901A
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US1732988A
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US1921415A
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US2032221A
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US2097932A
Cited
US2584500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |