US3227693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for vulcanizing rubbery polymers
Assignee: Richfield Oil Corp
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Filing: 1962-03-19
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Granted: 1966-01-04
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Expires: 1982-03-19
Abstract
No abstract record available.
Inventors
- 👤 Sargent Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1535; C08K5/1539
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
66 words
A PROCESS FOR VULCANIZING A RUBBERY POLYMER VULCANIZABLE WITH FREE MALEIC ANHYDRIDE AT TEMPERATURES AS LOW AS ROOM TEMPERATURE WHICH COMPRISES MIXING A VULCANIZING AMOUNT OF AN OIL SOLUBLE DIELS-ALDER ADDUCT OF MALEIC ANHYDRIDE, SAID ADDUCT BEING NON-REACTIVE WITH SAID RUBBERY POLYMER AT ROOM TEMPERATURE AND CAPABLE OF YIELDING A VULCANIZING AGENT WHEN HEATED WITH SAID RUBBERY POLYMER, AND THEREAFTER HEATING SAID MIXTURE TO VULCANIZATION TEMPERATURES.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |