US2470849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of by-product acids
Assignee: Gulf Research and Development Co
•
Filing: 1946-12-19
•
Granted: 1949-05-24
•
Expires: 1966-12-19
Abstract
No abstract record available.
Inventors
- 👤 William E Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2054979A
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US2163268A
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US2153302A
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US2193321A
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US2182056A
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US2217515A
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US2217516A
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US2318762A
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US2316099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |