Patent US3206415A successfully refreshed from Google Patents.
US3206415A
Expired / Lapsed
US
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Preparation of a polyurethane foam using an organosiloxymethyl alkane as a foam stabilizer
Assignee: Bayer AG
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Filing: 1960-12-20
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Granted: 1965-09-14
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Expires: 1980-12-20
Abstract
No abstract record available.
Inventors
- 👤 Horst Koepnick
- 👤 Guenther Loew
- 👤 Detlef Delfs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2375/00; C08J2375/04; C08J2483/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN THE PREPARATION OF A POLYURETHANE FOAM BY A PROCESS WHEREIN AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN ATOMS DETERMINABLE BY THE ZEREWITINOFF METHOD, A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN HYDROXYL NUMBER OF NOT MORE THAN ABOUT 225 AND AN ACID NUMBER OF NOT MORE THAN ABOUT 10 IS REACTED WITH AN ORGANIC POLYISOCYANATE IN A REACTION MIXTURE CONTAINING AN INERT GAS, SAID ORGANIC COMPOUND BEING REACTIVE WITH SADI ORGANIC POLYISOCYANATE TO FORM A POLYURETHANE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE A COMPOUND HAING THE FORMULA
Claim 2
Dependent Claim
91 words
IN THE PREPARATION OF A POLYURETHANE FOAM BY A PROCESS WHEREIN AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN ATOMS DETERMINABLE BY THE ZEREWITINOFF METHOD, A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN HYDROXYL NUMBER OF NOT MORE THAN ABOUT 225 AND AN ACID NUMBER OF NOT MORE THAN ABOUT 10 IS REACTED WITH AN ORGANIC POLYISOCYANATE IN A REACTION MIXTURE CONTAINING AN INERT GAS, SAID ORGANIC COMPOUND BEING REACTIVE WITH SADI ORGANIC POLYISOCYANATE TO FORM A POLYURETHANE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE A COMPOUND HAING THE FORMULA
References Cited (Backward Citations)
FR1212252A
Cited
US3040080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |