US2831907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of styrene and related compounds
Assignee: Individual
•
Filing: 1956-12-10
•
Granted: 1958-04-22
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Franklin D Mayfield
- 👤 Shaw James Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:35
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/321; C07C5/3332
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF DEHYDROGENATING AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST TWO CARBON ATOMS IN A SIDE CHAIN WHICH COMPRISES MIXING SAID HYDROCARBON WITH STEAM, SAID HYDROCARBON AND STEAM EACH BEING AT A TEMPERATURE LOWER THAN DEHYDROGENATION TEMPERATURE PRIOR TO MIXING HEATING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE REQUIRED FOR DEHYDROGENATION, AND CONTACTING SAID HEATED MIXTURE WHILE AT DEHYDROGENATION TEMPERATURE WITH A DEHYDROGENATION CATALYST.
Claim 2
Independent Claim
66 words
THE METHOD OF DEHYDROGENATING AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST TWO CARBON ATOMS IN A SIDE CHAIN WHICH COMPRISES MIXING SAID HYDROCARBON WITH STEAM, SAID HYDROCARBON AND STEAM EACH BEING AT A TEMPERATURE LOWER THAN DEHYDROGENATION TEMPERATURE PRIOR TO MIXING HEATING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE REQUIRED FOR DEHYDROGENATION, AND CONTACTING SAID HEATED MIXTURE WHILE AT DEHYDROGENATION TEMPERATURE WITH A DEHYDROGENATION CATALYST.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |