US3271471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimerization process
Assignee: Union Carbide Corp
•
Filing: 1965-03-23
•
Granted: 1966-09-06
•
Expires: 1985-03-23
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
C; C07; C07C; C07C2/00; C07C2603/00; C07C2603/92; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
PROCESS FOR THE PREPARATION OF CYCLIC DI-P-XYLYLENE WHICH COMPRISES FORMING REACTIVE P-XYLYLENE DIRADICALS HAVING THE STRUCTURAL FORMULA: FI-01 BY PYROLYZING A STREAM COMPRISED OF A P-XYLYLENE DIRADICAL PRECURSOR AT TEMPERATURES FROM ABOUT 900*C. TO ABOUT 1000*C. IN AN OXYGEN ENRICHED ENVIRONMENT AND CONTACTING SAID STREAM IN SAID ENVIRONMENT WITH AN IRON BASE ALLOY COMPOSITION CONSISTING ESSENTIALLY OF: PERCENT CHROMIUM 20-23 NICKEL 25-40 CARBON 0.02-0.15 RARE EARTH METAL 0.001-3.0 MOLYBDENUM 1-3 COPPER UP TO ABOUT 3.0 MANGANESE UP TO ABOUT 1.0 SILICON UP TO ABOUT 1.0 COLUMBIUM AND TANTALUM UP TO ABOUT 1.0 AND THE REMAINDER OF SAID ALLOY BEING IRON, CONDENSING THE REACTIVE DIRADICALS SO FORMED IN A FLUID MEDIUM CONTAINING AN INERT ORGANIC SOLVENT MAINTAINED AT A TEMPERATURE BELOW ABOUT 300*C., AND THEREAFTER RECOVERING THE CYCLIC DI-P-XYLYLENE.
Claim 2
Dependent Claim
128 words
PROCESS FOR THE PREPARATION OF CYCLIC DI-P-XYLYLENE WHICH COMPRISES FORMING REACTIVE P-XYLYLENE DIRADICALS HAVING THE STRUCTURAL FORMULA: FI-01 BY PYROLYZING A STREAM COMPRISED OF A P-XYLYLENE DIRADICAL PRECURSOR AT TEMPERATURES FROM ABOUT 900*C. TO ABOUT 1000*C. IN AN OXYGEN ENRICHED ENVIRONMENT AND CONTACTING SAID STREAM IN SAID ENVIRONMENT WITH AN IRON BASE ALLOY COMPOSITION CONSISTING ESSENTIALLY OF: PERCENT CHROMIUM 20-23 NICKEL 25-40 CARBON 0.02-0.15 RARE EARTH METAL 0.001-3.0 MOLYBDENUM 1-3 COPPER UP TO ABOUT 3.0 MANGANESE UP TO ABOUT 1.0 SILICON UP TO ABOUT 1.0 COLUMBIUM AND TANTALUM UP TO ABOUT 1.0 AND THE REMAINDER OF SAID ALLOY BEING IRON, CONDENSING THE REACTIVE DIRADICALS SO FORMED IN A FLUID MEDIUM CONTAINING AN INERT ORGANIC SOLVENT MAINTAINED AT A TEMPERATURE BELOW ABOUT 300*C., AND THEREAFTER RECOVERING THE CYCLIC DI-P-XYLYLENE.
References Cited (Backward Citations)
US2719131A
Cited
US3149175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |