Patent US3497372A successfully refreshed from Google Patents.
US3497372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and articles containing cross-linked asphaltene
Assignee: Sunoco Inc
•
Filing: 1966-09-22
•
Granted: 1970-02-24
•
Expires: 1986-09-22
Abstract
No abstract record available.
Inventors
- 👤 Seymour W Ferris
- 👤 James B Clelland
- 👤 Ernest P Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:57
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2909441A
Cited
US3264206A
Cited
US3265517A
Cited
US3243311A
Cited
US3245815A
Cited
US3281256A
Cited
US3287146A
Cited
US3303151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |