Patent US3480609A successfully refreshed from Google Patents.
US3480609A
Expired / Lapsed
US
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High-molecular weight,acetoxy-substituted saturated polybutadiene
Assignee: Shell USA Inc
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Filing: 1968-04-12
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Granted: 1969-11-25
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Expires: 1988-04-12
Abstract
No abstract record available.
Inventors
- 👤 Duncan W Frew Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/18; C; C08; C08C; C08C19/00; C08L; C08L91/00; C08L91/06; C08L91/08
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) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |