US3206432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polymers
Assignee: Shell USA Inc
•
Filing: 1961-05-15
•
Granted: 1965-09-14
•
Expires: 1981-05-15
Abstract
No abstract record available.
Inventors
- 👤 Carl G Schwarzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:20
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
THE HOMOGENEOUS REACTION PRODUCT OF (1) A LIQUI COPOLYMER OF MESITYL OXIDE AND BUTADIENE HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 700 AND 5,000, CONTAINING FROM 2 TO 35% COMBINED MESITYL OXIDE AND AT LEAST ABOUT 80% OF ITS DIENE UNITS ADDED IN 1,4-CONFIGURATION, AND (2) FROM 0.1 TO ABOUT 60% BY WEIGHT THEREOF OF MALEIC ANHYDRIDE.
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |