US2861872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for generating silicon tetrafluoride
Assignee: Columbian Carbon Co
•
Filing: 1955-03-30
•
Granted: 1958-11-25
•
Expires: 1975-03-30
Abstract
No abstract record available.
Inventors
- 👤 George L Heller
- 👤 Jr James A Watson
- 👤 Jr Carroll D Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:43
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
PROCESS FOR GENERATING A MIXTURE OF SILICON TETRAFLUORIDE AND WATER VAPOR WHICH COMPRISES REACTING HYDROGEN FLUORIDE WITH SILICON DIOXIDE WHILE THE LATTER IS SUSPENDED IN A HYGROSCOPIC POLYHYDRIC ALCOHOL WHICH IS A SOLVENT FOR HYDROGEN FLUORIDE AND BOILS AT A TEMPERATURE NOT LESS THAN 350*F., AND WHILE MAINTAINING THE SUSPENSION AT A TEMPERATURE IN EXCESS OF THE BOILING POINT OF
Claim 2
Dependent Claim
60 words
PROCESS FOR GENERATING A MIXTURE OF SILICON TETRAFLUORIDE AND WATER VAPOR WHICH COMPRISES REACTING HYDROGEN FLUORIDE WITH SILICON DIOXIDE WHILE THE LATTER IS SUSPENDED IN A HYGROSCOPIC POLYHYDRIC ALCOHOL WHICH IS A SOLVENT FOR HYDROGEN FLUORIDE AND BOILS AT A TEMPERATURE NOT LESS THAN 350*F., AND WHILE MAINTAINING THE SUSPENSION AT A TEMPERATURE IN EXCESS OF THE BOILING POINT OF
References Cited (Backward Citations)
US1959748A
Cited
US2535036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |