US3725316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-extinguishing polyurethanes containing brominated benzo-quinones
Assignee: Chemische Fabrik Kalk GmbH
•
Filing: 1970-07-01
•
Granted: 1973-04-03
•
Expires: 1990-07-01
Abstract
Abstract Polyurethane-based materials are rendered self-extinguishing by incorporating therein an effective amount of a brominated benzoquinone.
Inventors
- 👤 H Jenkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
The polyurethane material in accordance with claim 1 containing tetrabromoquinone.
Claim 2
Dependent Claim
28 words
The polyurethane material in accordance with claim 1 wherein the brominated quinone is present in an amount in the range from about 1 to about 15 weight percent.
Claim 3
Dependent Claim
28 words
The polyurethane material in accordance with claim 1 wherein the brominated quinone is present in an amount in the range from about 5 to about 10 weight percent.
Claim 4
Dependent Claim
15 words
The polyurethane material in accordance with claim 1 in the form of a rigid foam.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |