US3225005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of heat-stabilized copolymers of polyoxymethylenes
Assignee: Hoechst AG
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Filing: 1962-05-18
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Granted: 1965-12-21
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Expires: 1982-05-18
Abstract
No abstract record available.
Inventors
- 👤 Asmus Klaus-Dieter
- 👤 Fischer Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:05
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/22; C08G2/24; C08G2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE MANUFACTURE OF A HEAT-STABILIZED COPOLYMER WHICH COMPRISES HEATING, TO A TEMPERATURE OF 100 TO 150*C. AND AT A PH OF AT LEAST 8, AN AQUEOUS SUSSPENSION OF 1 TO 50 PARTS BY WEIGHT OF A COPOLYMER OF (A) A MEMBER SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND TRIOXANE WITH (B) A MEMBER SELECTED FROM THE GROUP CONSISTING OF ETHYLNE OXIDE, ETHYLENE GLYCOL FORMAL AND DIETHYLENE GLYCOL FORMAL, SAID COPOLYMER INITIALLY HAVING TERMINAL OXYMETHYLENE GROUPS, IN 99 TO 50 PARTS BY WEIGHT WATER AND IN ADMIXTURE WITH 0.1 TO 10% BY WEIGHT OF A FORMALDEHYDE-INTERCEPTING COMPOUND REACTIVE WITH FORMALDEHYDE UNDER THE REACTION CONDITIONS.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE MANUFACTURE OF A HEAT-STABILIZED COPOLYMER WHICH COMPRISES HEATING, TO A TEMPERATURE OF 100 TO 150*C. AND AT A PH OF AT LEAST 8, AN AQUEOUS SUSSPENSION OF 1 TO 50 PARTS BY WEIGHT OF A COPOLYMER OF (A) A MEMBER SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND TRIOXANE WITH (B) A MEMBER SELECTED FROM THE GROUP CONSISTING OF ETHYLNE OXIDE, ETHYLENE GLYCOL FORMAL AND DIETHYLENE GLYCOL FORMAL, SAID COPOLYMER INITIALLY HAVING TERMINAL OXYMETHYLENE GROUPS, IN 99 TO 50 PARTS BY WEIGHT WATER AND IN ADMIXTURE WITH 0.1 TO 10% BY WEIGHT OF A FORMALDEHYDE-INTERCEPTING COMPOUND REACTIVE WITH FORMALDEHYDE UNDER THE REACTION CONDITIONS.
References Cited (Backward Citations)
US2350350A
Cited
US2989509A
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US3027352A
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US3046249A
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US3072609A
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US3097913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |