Patent US3970573A successfully refreshed from Google Patents.
US3970573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroviscous fluids
Assignee: Individual
•
Filing: 1975-08-25
•
Granted: 1976-07-20
•
Expires: 1995-08-25
Abstract
Abstract Electroviscous fluids comprising particles of modified starch dispersed in high concentration in a dielectric oil, the particles containing an electrolyte which interrupts their crystallinity, renders them internally semi-conductive, and improves the surface condition of the particles in a manner to enhance their field-induced forces of attraction.
Inventors
- 👤 James W. Westhaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; C; C10; C10M; C10M171/00; C10M171/001; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
An electroviscous fluid consisting of a dielectric oil of relatively low viscosity and particles composed essentially of starch dispersed in said oil to a volume concentration of from 40 to 60 percent, said particles including an electrolyte in amount from 1 to 10 weight percent and including water in amount from 1 to 5 weight percent.
Claim 2
Dependent Claim
56 words
An electroviscous fluid consisting of a dielectric oil of relatively low viscosity and particles composed essentially of starch dispersed in said oil to a volume concentration of from 40 to 60 percent, said particles including an electrolyte in amount from 1 to 10 weight percent and including water in amount from 1 to 5 weight percent.
Claim 3
Dependent Claim
19 words
The electroviscous fluid of claim 1 in which said particles are essentially the dried and powdered gel of cornstarch.
Claim 4
Dependent Claim
20 words
The electroviscous fluid of claim 1 in which said particles are essentially the dried and powdered mucilage of degraded cornstarch.
Claim 5
Dependent Claim
14 words
The electroviscous fluid of claim 1 in which said particles are essentially whole-grain cornstarch.
Claim 6
Dependent Claim
15 words
The electroviscous fluid of claim 1 in which said particles are essentially whole-grain rice starch.
References Cited (Backward Citations)
US2417850A
Cited
US3047507A
Cited
US3427247A
Cited
US3250726A
Cited
US3304446A
Cited
US3385793A
Cited
US3367872A
Cited
US3397147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |