US3069481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tetrahalomethanes
Assignee: Pennwalt Corp
•
Filing: 1959-06-03
•
Granted: 1962-12-18
•
Expires: 1979-06-03
Abstract
No abstract record available.
Inventors
- 👤 Haszeldine Robert Neville
- 👤 Iserson Hyman
- 👤 Francis E Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:53
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
48 words
A METHOD FOR THE MANUFACTURE OF CARBON TETRACHLORIDE WHICH COMPRISES PYROLYZING PHOSGENE AT A TEMPERATURE BETWEEN ABOUT 300*C. AND ABOUT 700*C. AND AT A PRESSURE BETWEEN ABOUT 1000 P.S.I.G. AND 10,000 P.S.I.G. IN THE PRESENCE OF AN ACTIVATED CARBON CATALYST SUBSTANTIALLY COMPRISING A PARTIALLY DEHYDRATED CRYSTALLINE TYPE X
Claim 2
Independent Claim
48 words
A METHOD FOR THE MANUFACTURE OF CARBON TETRACHLORIDE WHICH COMPRISES PYROLYZING PHOSGENE AT A TEMPERATURE BETWEEN ABOUT 300*C. AND ABOUT 700*C. AND AT A PRESSURE BETWEEN ABOUT 1000 P.S.I.G. AND 10,000 P.S.I.G. IN THE PRESENCE OF AN ACTIVATED CARBON CATALYST SUBSTANTIALLY COMPRISING A PARTIALLY DEHYDRATED CRYSTALLINE TYPE X
Claim 3
Dependent Claim
17 words
THE METHOD ACCORDING TO CLAIM 1 WHEREIN THE PYROLYSIS IS CARRIED OUT IN THE PRESENCE OF COF2.
References Cited (Backward Citations)
US801100A
Cited
US2892875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |