Patent US4083818A successfully refreshed from Google Patents.
US4083818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymers
Assignee: Albemarle Corp
•
Filing: 1975-09-29
•
Granted: 1978-04-11
•
Expires: 1995-09-29
Abstract
Abstract Compounds such as methylbis(2,4,6-tribromophenyl)phosphonate and phenylbis(2,4,6-tribromophenyl)phosphonate are useful as flame retardants for organic polymers and resins such as polyurethane foams, polyesters, and polystyrene.
Inventors
- 👤 David R. Brackenridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5337; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
A fire retardant organic polymer or resin having incorporated therein a small but fire retardant effective amount of bis(2,4,6-tribromophenyl) methylphosphonate.
Claim 2
Dependent Claim
20 words
A fire retardant organic polymer or resin having incorporated therein a small but fire retardant effective amount of bis(2,4,6-tribromophenyl) methylphosphonate.
Claim 3
Dependent Claim
11 words
A composition of claim 1 wherein the organic polymer is polystyrene.
Claim 4
Dependent Claim
30 words
A polyurethane foam having incorporated therein a flame retardant amount of a phosphonate having the formula ##STR4## wherein R is a hydrocarbyl radical of up to about 8 carbon atoms.
Claim 5
Dependent Claim
30 words
A polyurethane foam having incorporated therein a flame retardant amount of a phosphonate having the formula ##STR4## wherein R is a hydrocarbyl radical of up to about 8 carbon atoms.
Claim 6
Dependent Claim
9 words
A foam of claim 3 wherein R is methyl.
Claim 7
Dependent Claim
9 words
A foam of claim 3 wherein R is phenyl.
References Cited (Backward Citations)
US2668842A
Cited
US2900405A
Cited
US3250827A
Cited
US3400085A
Cited
US3689602A
Cited
US3830886A
Cited
US3547842A
Cited
US3929688A
Cited
US3784652A
Cited
US3935123A
Cited
US3905922A
Cited
US3968060A
Cited
US3991010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |