US2900343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fluid for magnetic fluid clutch
Assignee: Texas Instruments Inc
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Filing: 1953-06-03
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Granted: 1959-08-18
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Expires: 1973-06-03
Abstract
No abstract record available.
Inventors
- 👤 Barns Robert Lee Roy
- 👤 Jr Ralph Tilman Dosher
- 👤 Humphries Mary Louise
- 👤 Jack K Jeanes
- 👤 Jr Luther Lawrence Lyon
- 👤 Perry Edward Gordon
- 👤 Speer Robert James
- 👤 Charles E Earhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:14
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2201/00; C10M2201/06; C10M2201/064; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/10; C10M2203/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A MAGNETIC FLUID FOR MAGNETIC FLUID CLUTCHES CONSISTING ESSENTIALLY OF A CARRIER LIQUID INCLUDING AS ITS MAJOR INGREDIENTS A U.S.P. WHITE OIL DERIVED FROM A NAPHTHENIC BASE STOCK AND HAVING A GENERAL FORMULA A CNH2N-3, A DENSITY OF AROUND 0.874 GM./ML. AT 2L*C., A POUR POINT BELOW -30*C., A VISCOSITY OF AROUND 126 CENTIPOISES AT 26*C., A REFRACTIVE INDEX AT 20*C. OF AROUND 1.4802 AND AN UNSULFONATABLE RESIDUE OF APPROXIMATELY 100%, AND DODECENE-1, THE DODECENE-1 BEING PRESENT IN A PROPORTION LESS THAN 30% BY WEIGHT, SAID CARRIER HAVING DISPERSED THEREIN A QUANTITY OF FINEYL DIVIDED DRY IRON PARTICLES OF AN AVERAGE SIZE OF BETWEEN ABOUT 3 AND 10 MICRONS AND THE RATIO OF IRON TO CARRIER OIL BEING BETWEEN ABOUT 2:1 AND 9:1 BY WEIGHT.
Claim 2
Dependent Claim
125 words
A MAGNETIC FLUID FOR MAGNETIC FLUID CLUTCHES CONSISTING ESSENTIALLY OF A CARRIER LIQUID INCLUDING AS ITS MAJOR INGREDIENTS A U.S.P. WHITE OIL DERIVED FROM A NAPHTHENIC BASE STOCK AND HAVING A GENERAL FORMULA A CNH2N-3, A DENSITY OF AROUND 0.874 GM./ML. AT 2L*C., A POUR POINT BELOW -30*C., A VISCOSITY OF AROUND 126 CENTIPOISES AT 26*C., A REFRACTIVE INDEX AT 20*C. OF AROUND 1.4802 AND AN UNSULFONATABLE RESIDUE OF APPROXIMATELY 100%, AND DODECENE-1, THE DODECENE-1 BEING PRESENT IN A PROPORTION LESS THAN 30% BY WEIGHT, SAID CARRIER HAVING DISPERSED THEREIN A QUANTITY OF FINEYL DIVIDED DRY IRON PARTICLES OF AN AVERAGE SIZE OF BETWEEN ABOUT 3 AND 10 MICRONS AND THE RATIO OF IRON TO CARRIER OIL BEING BETWEEN ABOUT 2:1 AND 9:1 BY WEIGHT.
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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |