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Patent US3658749A successfully refreshed from Google Patents.
US3658749A
Expired / Lapsed
US
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Modified oxymethylene polymers
Assignee: Celanese Corp
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Filing: 1970-06-16
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Granted: 1972-04-25
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Expires: 1990-06-16
Abstract
Abstract A MODIFIED OXYMETHYLENE POLYMER IS DISCLOSED AND CLAIMED WHICH COMPRISES AN OXYMETHYLENE POLYMER AND AN HYDROPHOBIC SILICA. THE CLAIMED COMPOSITION HAS IMPROVED HARDNESS, AND TENSILE STRENGTH OVER THE UNMODIFIED OXYMETHYLENE POLYMER WITHOUT A MARKED SACRIFICE OF FLEXIBILITY AND IMPACT STRENGHT.
Inventors
- 👤 Michael E Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:41
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |