US2858323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adducts of long chain unsaturated compounds
Assignee: Shell Development Co
•
Filing: 1956-01-24
•
Granted: 1958-10-28
•
Expires: 1976-01-24
Abstract
No abstract record available.
Inventors
- 👤 Curtis W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/44; C07; C07C; C07C51/00; C07C51/347; C07C51/353; C08G59/42; C08G59/4207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE REACTION PRODUCT OF MALEIC ANYDRIDE WITH A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
12 words
THE REACTION PRODUCT OF MALEIC ANYDRIDE WITH A COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
US2188882A
Cited
US2440985A
Cited
US2496358A
Cited
US2582235A
Cited
US2745844A
Cited
US2671810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |