US3215671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinked polyoxymethylenes and their preparation
Assignee: EIDP Inc
•
Filing: 1960-03-11
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Granted: 1965-11-02
•
Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Melby Lester Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:34
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS OF CROSSLINKING LINEAR POLYOXYMETHYLENE, WHICH COMPRISES IRRADIATING WITH ULTRAVIOLET LIGHT OF A WAVE LENGTH WITHIN THE RANGE OF 500 TO 4000 A. A MIXTURE OF A POLYOXYMETHYLENE HAVING A CHAIN OF AT LEAST 100 FORMALDEHYDE UNITS IN LENGTH, ABOUT 0.5-20% BY WEIGHT OF A FUNCTIONAL DERIVATIVE OF A CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ESTERS AMIDES AND IMIDES CONTAINING AT LEAST TWO CARBON-TO-CARBON UNSATURATED LINKAGES, SAID WEIGHT BEING BASED ON THE WEIGHT OF THE POLYOXYMETHYLENE, AND A PHOTOINITIATOR, AND THEREBY CROSSLINKING THE POLYOXYMETHYLENE.
Claim 2
Dependent Claim
87 words
THE PROCESS OF CROSSLINKING LINEAR POLYOXYMETHYLENE, WHICH COMPRISES IRRADIATING WITH ULTRAVIOLET LIGHT OF A WAVE LENGTH WITHIN THE RANGE OF 500 TO 4000 A. A MIXTURE OF A POLYOXYMETHYLENE HAVING A CHAIN OF AT LEAST 100 FORMALDEHYDE UNITS IN LENGTH, ABOUT 0.5-20% BY WEIGHT OF A FUNCTIONAL DERIVATIVE OF A CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ESTERS AMIDES AND IMIDES CONTAINING AT LEAST TWO CARBON-TO-CARBON UNSATURATED LINKAGES, SAID WEIGHT BEING BASED ON THE WEIGHT OF THE POLYOXYMETHYLENE, AND A PHOTOINITIATOR, AND THEREBY CROSSLINKING THE POLYOXYMETHYLENE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |