US2903380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing composite structures comprising rigid polyurethane foams and covering layers
Assignee: Bayer AG
•
Filing: 1955-02-03
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Granted: 1959-09-08
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Expires: 1975-02-03
Abstract
No abstract record available.
Inventors
- 👤 Hoppe Peter
- 👤 Pafirath Hans-Willi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:38
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J2375/00; C08J2375/04; C08J2375/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD FOR BONDING A POLYURETAHANE FOAM TO ALUMINUM COMPRISING COATING THE ALUMINUM WITH A LIQUID MIXTURE COMPRISING A POLYESTER, A POLYISOCYANATE AND ZINC CHROMATE, SAID MIXTURE BEING CAPABLE OF REACTING TO FORM A POLYURETHANE AND CONTAINING LESS THAN AN EQUIVALENT AMOUNT OF POLYISOCYANATE, APPLYING TO THE RESULTING COATING A MIXTURE COMPRISING A POLYESTER HAVING TERMINAL HYDROXYL GROUPS, A POLYISOCYANATE, A TERTIARY AMINE CATALYST AND WATER, SAID MIXTURE BEING CAPABLE OF FORMING A POLYURETHANE FOAM, AND THEREAFTER BRING ABOUT CHEMICAL REACTION TO FORM A POLYURETHANE FOAM FROM THE LAST SAID MIXTURE.
Claim 2
Independent Claim
91 words
A METHOD FOR BONDING A POLYURETAHANE FOAM TO ALUMINUM COMPRISING COATING THE ALUMINUM WITH A LIQUID MIXTURE COMPRISING A POLYESTER, A POLYISOCYANATE AND ZINC CHROMATE, SAID MIXTURE BEING CAPABLE OF REACTING TO FORM A POLYURETHANE AND CONTAINING LESS THAN AN EQUIVALENT AMOUNT OF POLYISOCYANATE, APPLYING TO THE RESULTING COATING A MIXTURE COMPRISING A POLYESTER HAVING TERMINAL HYDROXYL GROUPS, A POLYISOCYANATE, A TERTIARY AMINE CATALYST AND WATER, SAID MIXTURE BEING CAPABLE OF FORMING A POLYURETHANE FOAM, AND THEREAFTER BRING ABOUT CHEMICAL REACTION TO FORM A POLYURETHANE FOAM FROM THE LAST SAID MIXTURE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |