US3573173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering excess ammonia in urea synthesis by direct contact condensation with liquid ammonia
Assignee: Toyo Engineering Corp
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Filing: 1968-07-24
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Granted: 1971-03-30
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Expires: 1988-07-24
Abstract
Abstract A PROCESS FOR REMOVING EXCESS AMMONIA IN UREA SYNTHESIS WHICH COMPRISES SEPARATING EXCESS AMMONIA FROM A UREA SYNTHESIS EFFLUENT IN THE FORM OF AN AMMONIA GAS, MAKING THE AMMONIA GAS FREE OF CARBON DIOXIDE IF NECESSARY AND BRINGING THE AMMONIA GAS FREE OF CARBON DIOXIDE WITH RAW MATERIAL LIQUID AMMONIA THEREBY THE AMMONIA GAS IS CONDENSED TO FORM LIQUID AMMONIA AT HIGH TEMPERATURE.
Inventors
- 👤 Eiji Otsuka
- 👤 Kazumichi Kanai
- 👤 Tadao Sakai
- 👤 Shigeru Inoue
- 👤 Nobuyoshi Hashimoto
- 👤 Masatoshi Yakabe
- 👤 Tetsuo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/04
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |