Patent US3228936A successfully refreshed from Google Patents.
US3228936A
Expired / Lapsed
US
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Fluorination of urea, thiourea, guanidine, and melamine
Assignee: Dow Chemical Co
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Filing: 1960-10-17
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Granted: 1966-01-11
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Expires: 1980-10-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Davis
- 👤 Kenneth O Groves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:30
CPC Classifications
C; C06; C06B; C06B43/00; Y; Y10; Y10S; Y10S149/00; Y10S149/119; Y10S149/12; Y10S149/122
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
A PROCESS FOR THE FLUORINATION OF AN AMINE WHICH COMPRISES INTERMIXING AN AMINE SELECTED FROM THE GROUP CONSISTING OF UREA, THIOUREA, QUANIDINE, AND MELAMINE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL FLUORIDES, ALKALINE EARTH METAL FLUORIDES, AND OXIDES OF ALKALINE EARTH METALS, ALUMINUM, TITANIUM, VANADIUM, AND ZIRCONIUM, SAID COMPOUND BEING INTERMIXED WITH THE AMINE IN A WEIGHT RATIO OF FROM 0.5 TO 10 PARTS OF THE COMPOUND PER ONE PART OF THE AMINE, CONTACTING AT A TEMPERATURE IN THE RANGE OF -78*C. TO 50*C. THE RESULTING MIXTURE WITH A GASEOUS STREAM CONTAINING UP TO 50 VOLUME PERCENT OF FLUORINE AND THE REMAINDER A INERT GASEOUS DILUENT TO FLUORINATE THE AMINE, AND RECOVERING THE FLUORINATED AMINE FROM THE REACTION MIXTURE.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |