Patent US3012760A successfully refreshed from Google Patents.
US3087900A
Expired / Lapsed
US
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Polyether polyurethane foams stabilized with malic acid, citric acid, or nitrilotriacetic acid
Assignee: Union Carbide Corp
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Filing: 1960-04-26
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Granted: 1963-04-30
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Expires: 1980-04-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:28
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08J9/0023; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/16; C08J2375/00; C08J2375/04; C08J2375/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A METHOD FOR PREPARING POLYURETHANES WHEREIN A POLYETHER POLYOL WHICH HAS A MOLECULAR WEIGHT OF AT LEAST ABOUT 250 AND WHICH CONTAINS AT LEAST 2 ACTIVE HYDROGENS AS MEASURED AND DETERMINED BY THE ZEREWITINOFF TEST AND AN ORGANIC POLYISOCYANATE ARE REACTED TOGETHER IN THE PRESENCE OF AN ORGANIC TIN CATALYST AND FOAMED BY MEANS OF A BLOWING AGENT, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE REACTION MIXTURE A STABILIZING AMOUNT OF A POLYCARBOXYLIC ACID SELECTED FROM THE GROUP CONSITING OF MALIC ACID, CITRIC ACID, AND NITRILOTRIACETIC ACIDD.
Claim 2
Dependent Claim
88 words
IN A METHOD FOR PREPARING POLYURETHANES WHEREIN A POLYETHER POLYOL WHICH HAS A MOLECULAR WEIGHT OF AT LEAST ABOUT 250 AND WHICH CONTAINS AT LEAST 2 ACTIVE HYDROGENS AS MEASURED AND DETERMINED BY THE ZEREWITINOFF TEST AND AN ORGANIC POLYISOCYANATE ARE REACTED TOGETHER IN THE PRESENCE OF AN ORGANIC TIN CATALYST AND FOAMED BY MEANS OF A BLOWING AGENT, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE REACTION MIXTURE A STABILIZING AMOUNT OF A POLYCARBOXYLIC ACID SELECTED FROM THE GROUP CONSITING OF MALIC ACID, CITRIC ACID, AND NITRILOTRIACETIC ACIDD.
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |