US3149175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of di-para-xylylenes
Assignee: Union Carbide Corp
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Filing: 1960-08-22
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Granted: 1964-09-15
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Expires: 1980-08-22
Abstract
No abstract record available.
Inventors
- 👤 Dale F Pollart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:27
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/28; C07C13/32; C07C13/70; C07C2/00; C07C2/76; C07C2603/00; C07C2603/92; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR THE PREPARATION OF CYCLIC DI-P-XYLYLENE SUBSTANTIALLY FREE OF POLY-P-XYLYLENE WHICH INCLUDES THE STEPS OF PYROLYZING A MIXTURE OF STREAM AND P-XYLER AT A TEMPERATURE BETWEEN ABOUT 800*C. AND 1000*C. TO GENERATE THE REACTIVE DIRADICAL
Claim 2
Dependent Claim
37 words
A PROCESS FOR THE PREPARATION OF CYCLIC DI-P-XYLYLENE SUBSTANTIALLY FREE OF POLY-P-XYLYLENE WHICH INCLUDES THE STEPS OF PYROLYZING A MIXTURE OF STREAM AND P-XYLER AT A TEMPERATURE BETWEEN ABOUT 800*C. AND 1000*C. TO GENERATE THE REACTIVE DIRADICAL
References Cited (Backward Citations)
US2769786A
Cited
US2719131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |