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US2456732A
Expired / Lapsed
US
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Combined evaporator and boiler
Assignee: Individual
•
Filing: 1946-02-19
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Granted: 1948-12-21
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Expires: 1966-02-19
Abstract
No abstract record available.
Inventors
- 👤 Jr John E Pottharst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/06; B01D1/10; B01D1/28; B01D1/2881; B01D1/30; B01D1/305
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |