US2455243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic control of heat input to stillpots
Assignee: Gulf Research and Development Co
•
Filing: 1945-07-02
•
Granted: 1948-11-30
•
Expires: 1965-07-02
Abstract
No abstract record available.
Inventors
- 👤 Edward H Epprecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4283; B01D3/14; B01D3/32; B01D3/322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1601320A
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US2088385A
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US2149735A
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US2118029A
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US2205254A
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US2232840A
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US2386778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |