Patent US5296155A successfully refreshed from Google Patents.
US5296155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stratified carrier electroviscous fluids and apparatus
Assignee: United States Department of the Navy
•
Filing: 1992-01-24
•
Granted: 1994-03-22
•
Expires: 2012-01-24
Abstract
Abstract An improved electroviscous fluid formulated with discrete fluids of diverse densities, characterized in that settling of aggregate in functional apparatus is diminished. Aggregate particles having a density between the density of two fluids migrate to the boundary layer of the fluids when the fluids are at rest. By appropriately selecting the volume of the fluids in functional apparatus, the electroviscous fluid aggregate is placed in position for more immediate response when the apparatus is activated by electrical energy.
Inventors
- 👤 Ronald P. Reitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:30
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/001
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
A stratified electroviscous fluid comprising: a first fluid which is a dielectric and has a first density; a second fluid which is a dielectric and has a second density which is greater than said first density; and a plurality of particles having a third density which is greater than said first density but less than said second density; said second fluid being immiscible with said first fluid; said particles having the characteristic that they polarize in the presence of an electric field; a substantial number of said particles each comprising a core and an electrically nonconductive shield; said core being at least partially electrically conductive; said shield partially encompassing said core; said shield adapted to prevent particle to particle transmission of electric current; whereby, in a settled state, said electroviscous fluid will stratify into a first layer comprised substantially of said second fluid and a second layer comprised substantially of said first fluid, and said particles will be suspended in said electroviscous fluid substantially between said first layer and said second layer.
Claim 2
Dependent Claim
172 words
A stratified electroviscous fluid comprising: a first fluid which is a dielectric and has a first density; a second fluid which is a dielectric and has a second density which is greater than said first density; and a plurality of particles having a third density which is greater than said first density but less than said second density; said second fluid being immiscible with said first fluid; said particles having the characteristic that they polarize in the presence of an electric field; a substantial number of said particles each comprising a core and an electrically nonconductive shield; said core being at least partially electrically conductive; said shield partially encompassing said core; said shield adapted to prevent particle to particle transmission of electric current; whereby, in a settled state, said electroviscous fluid will stratify into a first layer comprised substantially of said second fluid and a second layer comprised substantially of said first fluid, and said particles will be suspended in said electroviscous fluid substantially between said first layer and said second layer.
Claim 3
Dependent Claim
18 words
An electroviscous fluid as claimed in claim 1, wherein each of said particles comprises a hollow buoyant body.
Claim 4
Dependent Claim
32 words
An electroviscous fluid as claimed in claim 1, wherein said first fluid has a density lower than about 1.0 g/cc and said second fluid has a density greater than about 1.0 g/cc.
Claim 5
Dependent Claim
73 words
An electroviscous fluid as claimed in claim 1, wherein said first fluid is mineral oil having a density for about 0.83 g/cc and said second fluid is a fluid selected from the group consisting of polyalkylene glycol having a density of about 0.99 g/cc, glycerine having a density of about 1.2 g/cc, dimethyl silicone oil having a density of about 0.98 g/cc, and phenyl silicone oil having a density of about 1.05 g/cc.
Claim 6
Dependent Claim
35 words
An electroviscous fluid as claimed in claim 1, wherein said first fluid is polyalkylene glycol having a density of about 0.99 g/cc and said second fluid is glycerine having a density of about 1.2 g/cc.
Claim 7
Dependent Claim
38 words
An electroviscous fluid as claimed in claim 1, wherein said first fluid is dimethyl silicone oil having a density for about 0.98 g/cc and said second fluid is phenyl silicone oil having a density of about 1.05 g/cc.
Claim 8
Dependent Claim
73 words
An electroviscous fluid as claimed in claim 1, wherein said first fluid is vegetable oil having a density of about 0.90 g/cc and said second fluid is a fluid selected from the group consisting of polyalkylene glycol having a density of about 0.99 g/cc, glycerine having a density of about 1.2 g/cc, dimethyl silicone oil having a density of about 0.98 g/cc and phenyl silicone oil having a density of about 1.05 g/cc.
Claim 9
Dependent Claim
14 words
An electroviscous fluid as claimed in claim 1, wherein said core comprises piezoelectric material.
Claim 10
Dependent Claim
20 words
An electroviscous fluid as claimed in claim 1 or claim 12, wherein said shield comprises at least one buoyant body.
Claim 11
Dependent Claim
14 words
An electroviscous fluid as claimed in claim 1, wherein said nonconductive shield comprises cement.
Claim 12
Dependent Claim
21 words
An electroviscous fluid as claimed in claim 10, wherein said nonconductive shield further comprises a buoyant body enclosed in said cement.
References Cited (Backward Citations)
US3427247A
Cited
US3367872A
Cited
US3397147A
Cited
US3984339A
Cited
US4129513A
Cited
US3970573A
Cited
US4416790A
Cited
US4502973A
Cited
US4645614A
Cited
US4687589A
Cited
US4737886A
Cited
WO1988002434A1
Cited
JPS6397694A
Cited
US4744914A
Cited
US4812251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |