US3222301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a polyurethane foam containing elemental sulphur
Assignee: Bayer AG
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Filing: 1961-11-20
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Granted: 1965-12-07
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Expires: 1981-11-20
Abstract
No abstract record available.
Inventors
- 👤 Dahm Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/02; C08K3/06; C08K3/30; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
IN THE PREPARATION OF A POLYURETHANE FOAM BY A PROCESS WHEREIN AN ORGANIC POLYISOCYANATE AND AN ORGANIC COMPOUND HAVING REACTIVE HYDROGEN ATOMS DETERMINABLE BY THE ZEREWITHINOFF METHOD, SAID ORGANICV COMPOUND BEING CAPABLE OF REACTING WITH POLYISOCYANATE TO FORM A POLYURETHANE, ARE MIXED TO FORM A FOAMABLE REACTION MIXTURE, THE IMPROVED METHOD OF PREPARING A FOAM WHILE AVOIDING DISCOLORATION IN THE C ENTER OF THE RESULTING BLOCK THEREOF WHICH COMPRISES MIXING THE SAID ORGANIC COMPOUND HAVING REACTIVE HYDROGENS WITH COLLOIDAL SULPHUR PRIOR TO ITS INCORPORATION IN THE FOAMABLE COMPOSITION.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |