US3852238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polycarbonate composition
Assignee: General Electric Co
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Filing: 1973-10-15
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Granted: 1974-12-03
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Expires: 1993-10-15
Abstract
Abstract A flame retardant polymer composition having in admixture therewith certain titanates and halogen containing flame retardant additives.
Inventors
- 👤 J Luce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:19
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A FLAME RETARDANT POLYMER COMPOSITION COMPRISING MIXTURES OF A CARBONATE POLYMER AND 0.01-2.0 WEIGHT PERCENT OF CALCIUM TITANATE, SAID POLYCARBONATE COMPOSED OF A COPOLYMER OF AN UNSUBSTITUTED DIHYDRIC PHENOL AND HALOGEN SUBSTITUTED DIHYDRIC PHENOL; SAID HALOGENATED BEING SELECTED FROM THE GROUP CONSISTING OF BROMINE AND CHLORINE.
Claim 2
Dependent Claim
46 words
A FLAME RETARDANT POLYMER COMPOSITION COMPRISING MIXTURES OF A CARBONATE POLYMER AND 0.01-2.0 WEIGHT PERCENT OF CALCIUM TITANATE, SAID POLYCARBONATE COMPOSED OF A COPOLYMER OF AN UNSUBSTITUTED DIHYDRIC PHENOL AND HALOGEN SUBSTITUTED DIHYDRIC PHENOL; SAID HALOGENATED BEING SELECTED FROM THE GROUP CONSISTING OF BROMINE AND CHLORINE.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the aromatic polycarbonate is a copolymer of 2,2-bis (4-hydroxyphenyl) propane and 2,2-(3, 3'',5,5''-tetrachloro-4,4''-dihydroxy-diphenyl) propane.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the aromatic polycarbonate is a copolymer of 2,2(4-hydroxyphenyl) propane and 2,2-(3,3'',5, 5''-tetrabromo-4,4''-dihydroxy-diphenyl) propane.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |