US2940733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange systems for cooling and cleaning contaminated heated gases
Assignee: Ajem Laboratories Inc
•
Filing: 1956-10-08
•
Granted: 1960-06-14
•
Expires: 1976-10-08
Abstract
No abstract record available.
Inventors
- 👤 Umbricht Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:38
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D47/08; B01D47/085; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE244267C
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US1419337A
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GB375132A
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US1962322A
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US1952269A
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FR763540A
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US2332450A
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US2409780A
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US2397230A
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US2527015A
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US2467346A
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US2699375A
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US2729301A
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GB732474A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |