Patent US3329645A successfully refreshed from Google Patents.
US3329645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer stabilization
Assignee: Phillips Petroleum Co
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Filing: 1964-03-30
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Granted: 1967-07-04
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Clifford W Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:03
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/378
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A COMPOSITION OF MATTER OF INCREASED STABILITY AGAINST OXIDATIVE DEGRADATION COMPRISING A POLYMER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND SOLID AND RUBBERY SYNTHETIC POLYMERS FORMED BY POLYMERIZING MONOMERS CONTAINING A VINYLIDENE GROUP (H2C=C>) HAVING INCORPORATED THEREIN A STABILIZING AMOUNT OF A BIS-HETEROCYCLIC NITROGEN-CONTAINING COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
50 words
A COMPOSITION OF MATTER OF INCREASED STABILITY AGAINST OXIDATIVE DEGRADATION COMPRISING A POLYMER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND SOLID AND RUBBERY SYNTHETIC POLYMERS FORMED BY POLYMERIZING MONOMERS CONTAINING A VINYLIDENE GROUP (H2C=C>) HAVING INCORPORATED THEREIN A STABILIZING AMOUNT OF A BIS-HETEROCYCLIC NITROGEN-CONTAINING COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2356388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |