US3288728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Para-xylylene copolymers
Assignee: Union Carbide Corp
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Filing: 1966-02-18
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Granted: 1966-11-29
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Expires: 1986-02-18
Abstract
No abstract record available.
Inventors
- 👤 William F Gorham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:08
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/025; B; B05; B05D; B05D1/00; B05D1/60; C07; C07C; C07C17/00; C07C17/093; C07C17/10; C07C17/12; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/782; C07C49/792; C07C2603/00; C07C2603/92; C08G2261/00; C08G2261/30; C08G2261/34; C08G2261/342; C08G2261/3424
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD FOR THE PREPARATION OF LINEAR COPOLYMERS OF P-XYLYLENES COMPRISING THE STEPS OF HEATING AT LEAST ONE SUBSTITUTED CYCLO DI-P-XYLYLENE HAVING UP TO ABOUT SIX AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE, AND MERCAPTO GROUPS TO A TEMPERATURE BETWEEN ABOUT 450* AND 700*C. FOR A TIME SUFFICIENT TO CLEAVE SUBSTANTIALLY ALL THE DI-P-XYLYLENE INTO VAPOROUS P-XYLYLENE DIRADICALS BUT INSUFFICIENT TO FURTHER DEGRADE THE SAID DIRADICALS, AND AT A PRESSURE SUCH THAT THE PARTIAL PRESSURE OF THE VAPOROUS P-XYLYLENE DIRADICALS IS BELOW ABOUT 0.75 MM. HG AND FORMING A VAPOROUS MIXTURE CONSISTING ESSENTIALLY OF AT LEAST TWO DIFFERENT VAPOROUS P-XYLYLENE DIRADICALS EACH HAVING THE BASIC STRUCTURE
Claim 2
Independent Claim
117 words
A METHOD FOR THE PREPARATION OF LINEAR COPOLYMERS OF P-XYLYLENES COMPRISING THE STEPS OF HEATING AT LEAST ONE SUBSTITUTED CYCLO DI-P-XYLYLENE HAVING UP TO ABOUT SIX AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE, AND MERCAPTO GROUPS TO A TEMPERATURE BETWEEN ABOUT 450* AND 700*C. FOR A TIME SUFFICIENT TO CLEAVE SUBSTANTIALLY ALL THE DI-P-XYLYLENE INTO VAPOROUS P-XYLYLENE DIRADICALS BUT INSUFFICIENT TO FURTHER DEGRADE THE SAID DIRADICALS, AND AT A PRESSURE SUCH THAT THE PARTIAL PRESSURE OF THE VAPOROUS P-XYLYLENE DIRADICALS IS BELOW ABOUT 0.75 MM. HG AND FORMING A VAPOROUS MIXTURE CONSISTING ESSENTIALLY OF AT LEAST TWO DIFFERENT VAPOROUS P-XYLYLENE DIRADICALS EACH HAVING THE BASIC STRUCTURE
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |