Patent US2797752A successfully refreshed from Google Patents.
Patent US3679549A successfully refreshed from Google Patents.
US3679549A
Expired / Lapsed
US
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Separation of ammonia in a thermosyphon evaporator
Assignee: Chemical Construction Corp
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Filing: 1969-12-15
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Granted: 1972-07-25
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Expires: 1989-12-15
Abstract
Abstract THE AMMONIA CONTENT OF AN AQUEOUS LIQUID AMMONIA STREAM IS SELECTIVELY VAPORIZED AS A CONCENTRATED VAPOR IN A THERMOSYPHON TYPE OF VAPORIZER BY INDIRECT HEAT EXCHANGE WITH A HOT FLUID, AND A SIDE STREAM OF THE CIRCULATING AQUEOUS AMMONIA IS DRAWN OFF AND SEPARATELY HEATED TO A HIGHER TEMPERATURE FOR RECOVERY OF ADDITIONAL AMMONIA VAPOR.
Inventors
- 👤 Daniel J Newman
- 👤 Louis A Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:33
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/10; B; B01; B01D; B01D1/00; B01D1/06; B01D1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |