Patent US3208993A successfully refreshed from Google Patents.
US3208993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic acetal polyallylidene oligosaccharides
Assignee: Shell USA Inc
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Filing: 1961-05-15
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Granted: 1965-09-28
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Expires: 1981-05-15
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Fischer
- 👤 Curtis W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04; C07H15/10; C07D; C07D319/00; C07D319/04; C07D319/06; C08; C08F; C08F8/00; C08F8/48; C08G; C08G16/00; C08G16/02; C08G16/025; C08G16/0256; C08F2810/00; C08F2810/20; C08F2810/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
2 words
POLYALLYLIDENE SUCROSE.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |