US3699192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphonium compounds
Assignee: U S Oil Co Inc
•
Filing: 1970-10-20
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Granted: 1972-10-17
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Expires: 1990-10-20
Abstract
Abstract A di lower alkyl phosphite acrylamide or methacrylamide, preferably with formaldehyde and tetrakis (hydroxymethyl) phosphonium halide are reacted to form a compound of the formula WHERE R1 and R2 are lower alkyl R3 is hydrogen or methyl and R4 is hydrogen or methylol. The compounds are useful as fire retardants, particularly in textiles, paper and other forms of cellulosic fibers as well as synthetic fibers.
Inventors
- 👤 Peter A Moretti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5353; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/535
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
10 words
A compound according to claim 1 wherein R4 is hydrogen.
Claim 2
Dependent Claim
12 words
A compound according to claim 2 wherein R1 and R2 are methyl.
Claim 3
Dependent Claim
10 words
A compound according to claim 3 wherein R4 is hydrogen.
Claim 4
Dependent Claim
10 words
A compound according to claim 1 wherein R4 is methylol.
Claim 5
Dependent Claim
12 words
A compound according to claim 5 wherein R1 and R2 are methyl.
Claim 6
Dependent Claim
10 words
A compound according to claim 1 wherein R4 is hydrogen.
References Cited (Backward Citations)
US2798086A
Cited
US3374292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |