Patent US3692879A successfully refreshed from Google Patents.
US3692879A
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US
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Polyphosphites
Assignee: Borg Warner Corp
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Filing: 1970-01-15
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Granted: 1972-09-19
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Expires: 1990-01-15
Abstract
Abstract Compounds are prepared having the formula WHERE R1 and R3 are alkyl, haloalkyl, aryl, haloaryl, alkenyl, aralkyl, haloalkenyl, cycloalkyl, R2 is a divalent aromatic, aliphatic or cycloaliphatic group and R4 and R5 are aryl or haloaryl. The compounds are useful as antioxidants.
Inventors
- 👤 Kenneth H Rattenbury
- 👤 Millard S Larrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5398; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/201; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
15 words
A compound according to claim 1 wherein R2 is alkylene, cycloalkylene, arylene, alkyleneoxyalkylene or alkylenethioalkylene.
Claim 2
Dependent Claim
61 words
A compound according to claim 1 wherein R1 and R3 are alkyl of one to 20 carbon atoms, phenyl, alkylphenyl having up to 18 carbon atoms in the alkyl group, halophenyl where the halogen has an atomic weight of 35 to 80, alkenyl of three to 20 carbon atoms, benzyl, or cycloalkyl having five to six carbon atoms in the ring.
Claim 3
Dependent Claim
12 words
A compound according to claim 3 wherein R4 and R5 are phenyl.
Claim 4
Dependent Claim
14 words
A compound according to claim 3 wherein R2 is alkylene, cycloalkylene, menthylene or arylene.
Claim 5
Dependent Claim
10 words
A compound according to claim 5 wherein R2 is alkylene.
Claim 6
Dependent Claim
12 words
A compound according to claim 6 wherein R4 and R5 are phenyl.
References Cited (Backward Citations)
US3489803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |