US2809871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift disengager
Assignee: Houdry Process Corp
•
Filing: 1951-06-12
•
Granted: 1957-10-15
•
Expires: 1971-06-12
Abstract
No abstract record available.
Inventors
- 👤 David B Ardern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:06
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005; B01J8/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE313613C
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DE278858C
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US688693A
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US824585A
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US1438996A
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US1597438A
Cited
GB311639A
Cited
US2246349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |