US2901445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular polyurethane reaction product containing polysiloxane and method of preparing same
Assignee: EIDP Inc
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Filing: 1955-06-17
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Granted: 1959-08-25
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Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2375/00; C08J2375/04; C08J2375/08; C08J2483/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE PREPARING OF CELLULAR REACTION PRODUCTS WHICH COMPRISES MIXING A LIQUID POLYMERIC POLYTETRAMETHYLENE ETHER GLYCOL-ORGANIC POLYISOCYANATE REACTION PRODUCT HAVING TERMINAL ISOCYANATE GROUPS AND WHEREIN AT LEAST 60% BY WEIGHT OF THE COMPOSITION IS THE RESIDUE OBTAINED BY REMOVING THE TERMINAL HYDROGEN ATOMS FROM A POLYTETRAMETHYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 750 TO 7,500, WITH FROM 0.05 TO 2.0% BY WEIGHT OF A POLYSILOXANE WHICH IS CHARACTERIZED BY THE RECURRING STRUCTURAL UNITS OF THE FORMULA
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE PREPARING OF CELLULAR REACTION PRODUCTS WHICH COMPRISES MIXING A LIQUID POLYMERIC POLYTETRAMETHYLENE ETHER GLYCOL-ORGANIC POLYISOCYANATE REACTION PRODUCT HAVING TERMINAL ISOCYANATE GROUPS AND WHEREIN AT LEAST 60% BY WEIGHT OF THE COMPOSITION IS THE RESIDUE OBTAINED BY REMOVING THE TERMINAL HYDROGEN ATOMS FROM A POLYTETRAMETHYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 750 TO 7,500, WITH FROM 0.05 TO 2.0% BY WEIGHT OF A POLYSILOXANE WHICH IS CHARACTERIZED BY THE RECURRING STRUCTURAL UNITS OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |