US2940988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable free radicals
Assignee: Shell USA Inc
•
Filing: 1956-11-23
•
Granted: 1960-06-14
•
Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Galvin M Coppinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/29; C07C45/296; C07C49/00; C07C49/587; C07C49/703; C07C49/747
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
STABLE FREE RADICALS OF THE FORMULA
Claim 2
Dependent Claim
6 words
STABLE FREE RADICALS OF THE FORMULA
References Cited (Backward Citations)
US2785188A
Cited
US2794051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |