US3248349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular polyurethane plastics prepared from a tall oil ester
Assignee: Bayer Corp
•
Filing: 1962-05-03
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Granted: 1966-04-26
•
Expires: 1982-05-03
Abstract
No abstract record available.
Inventors
- 👤 John F Szabat
- 👤 Paul G Gemeinhardt
- 👤 William C Darr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/36; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2350/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING IN THE PRESENCE OF A BLOWING AGENT, AN ORGANIC POLYISOCYANATE WITH AN ESTER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 150 TO ABOUT 250 WHICH HAS BEEN OBTAINED BY A PROCESS WHICH COMPRISES REACTING TALL OIL WITH A POLYHYDRIC ALCOHOL HAVING FROM 5 TO 8 FREE HYDROXYL GROUPS.
Claim 2
Dependent Claim
59 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING IN THE PRESENCE OF A BLOWING AGENT, AN ORGANIC POLYISOCYANATE WITH AN ESTER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 150 TO ABOUT 250 WHICH HAS BEEN OBTAINED BY A PROCESS WHICH COMPRISES REACTING TALL OIL WITH A POLYHYDRIC ALCOHOL HAVING FROM 5 TO 8 FREE HYDROXYL GROUPS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |