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Patent US3380939A successfully refreshed from Google Patents.
US3380939A
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Reaction products of unsaturated heterocyclic lactones with polyhydroxy compounds
Assignee: Shell USA Inc
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Filing: 1965-06-25
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Granted: 1968-04-30
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Expires: 1985-06-25
Abstract
No abstract record available.
Inventors
- 👤 Richard A Palm
- 👤 Harald H O Cherdron
- 👤 Hans H W Ohse
- 👤 Friedrich W A G K Korte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/91; C08G63/912; C08F; C08F8/00; C08G63/78; C08G63/82; C08G63/823; C08G69/00; C08G75/00; C08G75/12
Claims Analysis
Total Claims: 0
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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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |