US2748849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control of concentrating evaporators
Assignee: Dow Chemical Co
•
Filing: 1953-11-18
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Granted: 1956-06-05
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Expires: 1973-11-18
Abstract
No abstract record available.
Inventors
- 👤 Hart Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:48
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/42; B; B01; B01D; B01D1/00; B01D1/0082; Y; Y10; Y10S; Y10S203/00; Y10S203/19
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |