US3681272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane foam forming process using as a gel catalyst a mixture of 2-ethylhexoic acid and a stannous compound
Assignee: Air Products and Chemicals Inc
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Filing: 1971-04-29
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Granted: 1972-08-01
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Expires: 1991-04-29
Abstract
Abstract A PROCESS OF MAKING A POLYURETHANE PLASTIC WHICH COMPRISES MIXING AN ORGANIC COMPOUND HAVING REACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF METHOD HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN ORGANIC POLYISOCYANATE, WATER AND A CATALYTIC AMOUNT OF A CATALYST CONTAINING A CARBOXYLIC ACID AND AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF STANNOUS HYDROXIDE, BIS(ETHYLHEXANOXYLOXYTIN) OXIDE, ETHYLHEXANOXYLTIN HYDROXIDE AND BIS(HYDROXYSTANNOUS) OXIDE.
Inventors
- 👤 Carl R Gloskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/166; C08G18/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |