US3819748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus derivatives of tetrafunctional aromatic compounds
Assignee: Chevron Belgium NV
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Filing: 1972-05-05
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Granted: 1974-06-25
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Expires: 1992-05-05
Abstract
Abstract DISCLOSED ARE BENZOBISPHOSPHATES OF THE FORMULA: 2,6-DI(Z=),2,6-DI(X-)BENZO(1,2-D:4,5-D'')BIS-1,3,2- DIOXAPHOSPHOLE WHEREIN: X REPRESENTS HALOGEN, NR2 WHERE R IS HYHYDROGEN, ALKYL, OR CYCLOALKYL, HAVING UP TO 30 CARBON ATOMS OR ARYL OR ARALKYL HAVING UP TO 22 CARBON ATOMS, PYRROLIDINO, PIPERIDINO OR MORPHOLINO; Z IS OXYGEN OR SLFUR OR MAY BE ABSENT. THESE COMPOUNDS ARE EFFECTIVE AS ANTI-WEAR AND ANTIOXIDANT ADDITIVES FOR LUBRICATING OILS. THEY ALSO HAVE FLAME RETARDANT PROPERTIES.
Inventors
- 👤 L Dulog
- 👤 S Dewaele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:45
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657109; C07F9/657136; C07F9/657154; C07F9/6574; C07F9/65746
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |