US3226366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyoxymethylenes which are stable to the action of heat
Assignee: Montedison SpA
•
Filing: 1962-03-27
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Granted: 1965-12-28
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Expires: 1982-03-27
Abstract
No abstract record available.
Inventors
- 👤 Bezzi Silvio
- 👤 Galiazzo Guido
- 👤 Bandel Alberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:57
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/30; C08G2/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF STABILIZING A POLYOXYMETHYLENE DIHYDROXIDE AGAINST HEAT, THIS METHOD COMPRISING ACETYLATING SAID POLYOXYMETHYLENE DIHYDROXIDE WITH AN ACTYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF METHYLENEGLYCOL DIACETATE AND MIXTURES OF METHYLENGLYCOL DIACETATE WITH A POLYOXYMETHYLEN DIACETATE WHEREIN THE NUMBER OF OXYMETHYLENE GROUPS IS GREATER THAN 1 AND LOWER THAN 10, SAID ACETYLATION BEING CARRIED OUT AT A TEMPERATURE OF FROM ABOUT 170* TO 210*C. FOR A TIME NOT EXCEEDING ABOUT 3 HOURS, THE WEIGHT RATIO OF POLYMER TO ACETYLATING AGENT BEING FROM ABOUT 1:5 TO 1:15.
Claim 2
Independent Claim
87 words
A METHOD OF STABILIZING A POLYOXYMETHYLENE DIHYDROXIDE AGAINST HEAT, THIS METHOD COMPRISING ACETYLATING SAID POLYOXYMETHYLENE DIHYDROXIDE WITH AN ACTYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF METHYLENEGLYCOL DIACETATE AND MIXTURES OF METHYLENGLYCOL DIACETATE WITH A POLYOXYMETHYLEN DIACETATE WHEREIN THE NUMBER OF OXYMETHYLENE GROUPS IS GREATER THAN 1 AND LOWER THAN 10, SAID ACETYLATION BEING CARRIED OUT AT A TEMPERATURE OF FROM ABOUT 170* TO 210*C. FOR A TIME NOT EXCEEDING ABOUT 3 HOURS, THE WEIGHT RATIO OF POLYMER TO ACETYLATING AGENT BEING FROM ABOUT 1:5 TO 1:15.
References Cited (Backward Citations)
US1942110A
Cited
US2492955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |