US3412167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of p-xylylenes
Assignee: Union Carbide Corp
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Filing: 1966-12-09
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Granted: 1968-11-19
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Expires: 1986-12-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/025; C07; C07C; C07C2/00; C07C2/76; C07C2603/00; C07C2603/92; C08G2261/00; C08G2261/30; C08G2261/34; C08G2261/342; C08G2261/3424; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942; Y10S585/949; Y10S585/952
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A METHOD FOR PREPARING P-XYLYLENES BY PYROLYSIS OF P-XYLENE GENERATING P-XYLYLENE DIRADICALS AND THEREAFTER CONDENSING SAID DIRADICALS TO SAID P-XYLYLENES, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID PY-XYLENE WITH METHANE DURING THE PYROLYSIS THEREOF, SAID METHANE BEING PRESENT IN AN AMOUNT SUCH THAT THE MOLAR RATIO OF METHANE TO P-XYLENE IS BETWEEN 25/1 TO 100/1 WHEREBY THE PROCESS EFFICIENCY IS IMPROVED.
Claim 2
Dependent Claim
61 words
IN A METHOD FOR PREPARING P-XYLYLENES BY PYROLYSIS OF P-XYLENE GENERATING P-XYLYLENE DIRADICALS AND THEREAFTER CONDENSING SAID DIRADICALS TO SAID P-XYLYLENES, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID PY-XYLENE WITH METHANE DURING THE PYROLYSIS THEREOF, SAID METHANE BEING PRESENT IN AN AMOUNT SUCH THAT THE MOLAR RATIO OF METHANE TO P-XYLENE IS BETWEEN 25/1 TO 100/1 WHEREBY THE PROCESS EFFICIENCY IS IMPROVED.
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |