Patent US3895074A successfully refreshed from Google Patents.
US3895074A
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Phosphine oxide flame retardants
Assignee: EIDP Inc
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Filing: 1973-11-16
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Granted: 1975-07-15
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Expires: 1993-11-16
Abstract
Abstract Aromatic phosphine oxide compounds are useful as flame retardants in synthetic polymers and textiles. Exemplary is 2,4,5,6-tetrabromo-1,3-xylylenebis(diphenylphosphine oxide).
Inventors
- 👤 Joseph J Mrowca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5397; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5329; C07F9/5333; D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
6 words
A FLAME-RETARDANT COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
A FLAME-RETARDANT COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
27 words
A compound of claim 1 in which at least one of R and R1 is phenyl, X is chlorine or bromine and a is 2 to l4.
Claim 4
Dependent Claim
15 words
A compound of claim 1 in which R R1 phenyl, a 3 and b 3.
Claim 5
Dependent Claim
15 words
The compound of claim 2 in which X bromine and a 4; 2,4, 5,6-tetrabromo-1,3-xylylenebis(diphenylphosphine oxide).
Claim 6
Dependent Claim
14 words
The compound of claim 2 in which X bromine and a 2; 2,5-dibromo-1,4-xylylenebis(diphenylphosphine oxide).
Claim 7
Dependent Claim
15 words
The compound of claim 2 in which X bromine and a 4; 2,3, 5,6-tetrabromo-1,4-xylylenebis(diphenylphosphine oxide).
Claim 8
Dependent Claim
15 words
The compound of claim 2 in which X chlorine and a 4; 2, 3,5,6-tetrachloro-1,4-xylylenebis(diphenylphosphine oxide).
Claim 9
Dependent Claim
15 words
The compound of claim 2 in which X chlorine and a 4; 2, 4,5,6-tetrachloro-1,3-xylylenebis(diphenylphosphine oxide).
Claim 10
Dependent Claim
23 words
The compound of claim 1 in which X OCH3 and SCH3, a 2, b 2 and R R1 phenyl; 2-methoxy-5-methylthio-1,4-xylylenebis (diphenyl phosphine oxide).
Claim 11
Dependent Claim
21 words
The compound of claim 1 in which X OCH3 and SO2CH3, a 2, b 2 and R R1 phenyl; 2-methoxy-5-methylsulfonyl-1,4-xylylenebis(diphenylphosphine oxide).
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |