Patent US3055871A successfully refreshed from Google Patents.
US3055871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyformal-diisocyanate condensation prepolymers
Assignee: Individual
•
Filing: 1959-01-09
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Granted: 1962-09-25
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Expires: 1979-01-09
Abstract
No abstract record available.
Inventors
- 👤 Milton S Heffler
- 👤 Christopher L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PERPOLYMER COMPRISING THE REACTION PRODUCT OF AN ALIPHATIC POLYFORMAL AND AN ORGANIC DISOCYANATE WHEREIN THE INSOCYANATE GROUPS CONSTITUTE FROM ABOUT 2,4 TO ABOUT 13.0% OF THE PREPOLYMER AND THE RATIO OF HY DROXYL GROUPS TO ISOCYANATE GROUPS IN THE REACTANTS IS FROM DETWEEN 1:1.1 TO ABOUT 1:3.3; AND POLYFORMAL HAVING ONLY TERMINAL HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF FROM ABOUT 750 TO ABOUT 4500 AND BEING THE OPEN CHAIN CONDENSATION OF FORMALDEHYDE AND AN ALIPHATIC POLYHYDROXY COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 62 TO ABOUT 425, THE RATIO OF FORMALDEHYDE TO HYDROXYL GROUPS IN SAID POLYFORMAL BEING FROM ABOUT 3:4 TO ABOUT 1:1:
Claim 2
Dependent Claim
107 words
A PERPOLYMER COMPRISING THE REACTION PRODUCT OF AN ALIPHATIC POLYFORMAL AND AN ORGANIC DISOCYANATE WHEREIN THE INSOCYANATE GROUPS CONSTITUTE FROM ABOUT 2,4 TO ABOUT 13.0% OF THE PREPOLYMER AND THE RATIO OF HY DROXYL GROUPS TO ISOCYANATE GROUPS IN THE REACTANTS IS FROM DETWEEN 1:1.1 TO ABOUT 1:3.3; AND POLYFORMAL HAVING ONLY TERMINAL HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF FROM ABOUT 750 TO ABOUT 4500 AND BEING THE OPEN CHAIN CONDENSATION OF FORMALDEHYDE AND AN ALIPHATIC POLYHYDROXY COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 62 TO ABOUT 425, THE RATIO OF FORMALDEHYDE TO HYDROXYL GROUPS IN SAID POLYFORMAL BEING FROM ABOUT 3:4 TO ABOUT 1:1:
References Cited (Backward Citations)
US2394910A
Cited
GB773991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |