Patent US3730898A successfully refreshed from Google Patents.
US3730898A
Expired / Lapsed
US
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Functional fluid compositions of increased fire resistance
Assignee: McDonnell Douglas Corp
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Filing: 1971-06-21
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Granted: 1973-05-01
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Expires: 1991-06-21
Abstract
Abstract PRODUCTION OF FUNCTIONAL FLUIDS, PARTICULARLY AIRCRAFT HYDRAULIC FLUIDS, OF IMPROVED FIRE RESISTANCE, COMPRISING A FUNCTIONAL FLUID BASE STOCK, SUCH AS A PHOSPHATE ESTER, E.G., TRI-N-BUTYL PHOSPHATE, OR MIXTURES OF SUCH BASE STOCKS, AND A SMALL AMOUNT OF A SELENOPHENE OR TELLUROPHHENE COMPOUND, PREFERABLY A CHLORINATED SELENOPHENE OR A CHLORINATED TELLUROPHENE, E.G., TETRACHLOROSELENOPHENE OR TETRACHLOROTELLUROPHENE.
Inventors
- 👤 R Mccord
- 👤 D Nail
- 👤 M Sheratte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:41
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/284; C10M2207/285; C10M2207/286; C10M2207/34; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/049; C10M2223/06; C10M2223/065; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/06; C10N2040/12; C10N2040/13; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |