Patent US3000865A successfully refreshed from Google Patents.
US3000865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of propylene oxide and alkylene sulfides
Assignee: Dow Chemical Co
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Filing: 1958-07-03
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Granted: 1961-09-19
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Expires: 1978-07-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Gurgiolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:48
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/12; C08G65/00; C08G65/02; C08G65/26; C08G65/2636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A SOLID POLYMERIC COMPOSITION HAVING AN AVERAGE MOLECULAR WEIGHT OVER 100,000 AND A SOFTENING POINT ABOVE 60*C. WHICH COMPRISES PROPYLENE OXIDE COPOLYMERIZED WITH AN ALKYLENE SULFIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE SULFIDE, PROPYLENE SULFIDE, ISOBUTYLENE SULFIDE, 1,2-BUTYLENE SULFIDE, 2,3-BUTYLENE SULFIDE, STYRENE SULFIDE, AND MIXTURES THEREOF, CONTAINING IN COMBINED FORM FROM 5 TO 95 WEIGHT PERCENT OF PROPYLENE OXIDE AND THE REMAINDER THE ALKYLENE SULFIDE.
Claim 2
Dependent Claim
66 words
A SOLID POLYMERIC COMPOSITION HAVING AN AVERAGE MOLECULAR WEIGHT OVER 100,000 AND A SOFTENING POINT ABOVE 60*C. WHICH COMPRISES PROPYLENE OXIDE COPOLYMERIZED WITH AN ALKYLENE SULFIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE SULFIDE, PROPYLENE SULFIDE, ISOBUTYLENE SULFIDE, 1,2-BUTYLENE SULFIDE, 2,3-BUTYLENE SULFIDE, STYRENE SULFIDE, AND MIXTURES THEREOF, CONTAINING IN COMBINED FORM FROM 5 TO 95 WEIGHT PERCENT OF PROPYLENE OXIDE AND THE REMAINDER THE ALKYLENE SULFIDE.
References Cited (Backward Citations)
US2484370A
Cited
US2706189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |