US3198757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polyurethanes
Assignee: M&T Chemicals Inc
•
Filing: 1961-06-12
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Granted: 1965-08-03
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Michael A Ricciardi
- 👤 William J Considine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF MAKING A CELLULAR POLYURETHANE PLASTIC WHICH COMPRISES MIXING AN ORGANIC COMPOUND HAVING REACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF REACTION HVAING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN ORGANIC POLYISOCYANATE, WATER, AND A CATALYTIC AMOUNT OF (A) A GEL CATALYST SN(OCOR)2 AND (B) A BLOWING CATALYST R''3SNX WHEREIN R AND R'' ARE HYDROCARBON RADICALS; AND X IS SELECTED FROM THE GROUP CONSITING OF NEGATIVE RESIDUAL PORTIONS OF AN ORGANIC CARBOXYLIC ACID, A MERCAPTAN, AN ALCOHOL, A PHENOL, AND A HALOGEN ACID.
Claim 2
Independent Claim
87 words
THE METHOD OF MAKING A CELLULAR POLYURETHANE PLASTIC WHICH COMPRISES MIXING AN ORGANIC COMPOUND HAVING REACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF REACTION HVAING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN ORGANIC POLYISOCYANATE, WATER, AND A CATALYTIC AMOUNT OF (A) A GEL CATALYST SN(OCOR)2 AND (B) A BLOWING CATALYST R''3SNX WHEREIN R AND R'' ARE HYDROCARBON RADICALS; AND X IS SELECTED FROM THE GROUP CONSITING OF NEGATIVE RESIDUAL PORTIONS OF AN ORGANIC CARBOXYLIC ACID, A MERCAPTAN, AN ALCOHOL, A PHENOL, AND A HALOGEN ACID.
References Cited (Backward Citations)
US2602783A
Cited
FR1212252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |