Patent US493328A successfully refreshed from Google Patents.
Patent US2801904A successfully refreshed from Google Patents.
US2801904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved method for obtaining pyrosulfuryl fluoride from calcium fluoride and sulfur trioxide
Assignee: EIDP Inc
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Filing: 1955-05-31
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Granted: 1957-08-06
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Earl L Muetterties
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:01
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/45; C01B17/4561
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
PROCESS FOR PREPARING PYROSULFURYL FLUORIDE WHICH COMPRISES HEATING AND REACTING CALCIUM FLUORIDE WITH MORE THAN TWO MOLES OF SULFUR TRIOXIDE PER MOLE OF CALCIUM FLUORIDE AT A TEMPERATURE OF 100 TO 300*C.,, TREATING THE RESULTANT RECATION MIXTURE AT A TEMPERATURE BELOW 80*C. WITH CONCENTRATED SULFURIC ACID IN WATER, AND SEPARATING PYROSULFURYL FLUORIDE THEREFROM BY DISTILLATION.
Claim 2
Dependent Claim
55 words
PROCESS FOR PREPARING PYROSULFURYL FLUORIDE WHICH COMPRISES HEATING AND REACTING CALCIUM FLUORIDE WITH MORE THAN TWO MOLES OF SULFUR TRIOXIDE PER MOLE OF CALCIUM FLUORIDE AT A TEMPERATURE OF 100 TO 300*C.,, TREATING THE RESULTANT RECATION MIXTURE AT A TEMPERATURE BELOW 80*C. WITH CONCENTRATED SULFURIC ACID IN WATER, AND SEPARATING PYROSULFURYL FLUORIDE THEREFROM BY DISTILLATION.
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |