Patent US3315442A successfully refreshed from Google Patents.
US3315442A
Expired / Lapsed
US
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Quenching of crude melamine gases
Assignee: Wyeth Holdings LLC
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Filing: 1964-10-05
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Granted: 1967-04-25
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Expires: 1984-10-05
Abstract
No abstract record available.
Inventors
- 👤 Yuan Lun Lee
- 👤 Kurose George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:26
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/56; C07D251/60; C07D251/62; B; B01; B01D; B01D2257/00; B01D2257/40; B01D2257/406; B01D2257/50; B01D2257/504; Y; Y02; Y02P; Y02P20/00; Y02P20/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN THE PRODUCTION OF MELAMINE FROM UREA WHEREIN A STREAM OF CRUDE MELAMINE GAS CONTAINING AMMONIA, CARBON DIOXIDE, AND INERT GASES IS INTRODUCED INTO A QUENCHING ZONE OF SPRAYED WATER WHEREBY THE GASES ARE COOLED AND A SLURRY OF PURIFIED MELAMINE IS FORMED, THE IMPROVEMENT WHICH COMPRISES BLANKETING THE STREAM OF CRUDE MELAMINE GAS WITH GASEOUS AMMONIA IN SAID QUENCHING ZONE.
Claim 2
Dependent Claim
61 words
IN THE PRODUCTION OF MELAMINE FROM UREA WHEREIN A STREAM OF CRUDE MELAMINE GAS CONTAINING AMMONIA, CARBON DIOXIDE, AND INERT GASES IS INTRODUCED INTO A QUENCHING ZONE OF SPRAYED WATER WHEREBY THE GASES ARE COOLED AND A SLURRY OF PURIFIED MELAMINE IS FORMED, THE IMPROVEMENT WHICH COMPRISES BLANKETING THE STREAM OF CRUDE MELAMINE GAS WITH GASEOUS AMMONIA IN SAID QUENCHING ZONE.
References Cited (Backward Citations)
US2755887A
Cited
US3132143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |