US2806636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bladed airlock structure
Assignee: SUPERIOR SEPARATOR Co
•
Filing: 1953-12-14
•
Granted: 1957-09-17
•
Expires: 1973-12-14
Abstract
No abstract record available.
Inventors
- 👤 William B Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:24
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002; F; F16; F16K; F16K24/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2750123A
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US763033A
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US829204A
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US1399634A
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US1371343A
Cited
US1585768A
Cited
US1639415A
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US2539253A
Cited
US2751115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |