Assignee
FERROFLUIDICS CORP
US84 patents
Top patents by PatentIndex Score
US5780741AJul 14, 1998
Sensor employing a sliding magnet suspended on ferrofluid
FERROFLUIDICS CORP59 citations96
US4898480AFeb 6, 1990
Compact ferrofluidic electrically conducting sealed bearing
FERROFLUIDICS CORP57 citations96
US4673997AJun 16, 1987
Electrically conductive ferrofluid bearing and seal apparatus and low-viscosity electrically conductive ferrofluid used therein
FERROFLUIDICS CORP61 citations96
US4604222AAug 5, 1986
Stable ferrofluid composition and method of making and using same
FERROFLUIDICS CORP60 citations96
US4604229AAug 5, 1986
Electrically conductive ferrofluid compositions and method of preparing and using same
FERROFLUIDICS CORP79 citations96
US4430239AFeb 7, 1984
Ferrofluid composition and method of making and using same
FERROFLUIDICS CORP84 citations96
US4356098AOct 26, 1982
Stable ferrofluid compositions and method of making same
FERROFLUIDICS CORP112 citations96
US5461677AOct 24, 1995
Loudspeaker
FERROFLUIDICS CORP55 citations94
US5452520ASep 26, 1995
Ferrofluid inclinometer
FERROFLUIDICS CORP65 citations94
US4694213ASep 15, 1987
Ferrofluid seal for a stationary shaft and a rotating hub
FERROFLUIDICS CORP67 citations94
US4171818AOct 23, 1979
Dynamic lip seal using ferrofluids as sealant/lubricant
FERROFLUIDICS CORP88 citations94
US5969589AOct 19, 1999
Quiet ferrofluid solenoid
FERROFLUIDICS CORP27 citations93
US5955934ASep 21, 1999
Quiet ferrofluid solenoid with cushion
FERROFLUIDICS CORP32 citations93
US5908987AJun 1, 1999
Sensor employing a sliding ferrofluid mass in a coated, non-wetting, housing
FERROFLUIDICS CORP45 citations93
US4630943ADec 23, 1986
Ferrofluid bearing and seal apparatus
FERROFLUIDICS CORP65 citations93
US4531846AJul 30, 1985
Compact ferrofluid seal and bearing assembly
FERROFLUIDICS CORP32 citations93
US4506895AMar 26, 1985
Self-activating ferrofluid seal apparatus and method of use
FERROFLUIDICS CORP35 citations93
US4357024ANov 2, 1982
Ferrofluid rotary-shaft seal apparatus and method
FERROFLUIDICS CORP39 citations93
US6290894B1Sep 18, 2001
Ferrofluid sculpting apparatus
FERROFLUIDICS CORP44 citations92
US5824149AOct 20, 1998
Method and apparatus for controlling crystal temperature gradients in crystal growing systems
FERROFLUIDICS CORP23 citations92
US5462685AOct 31, 1995
Ferrofluid-cooled electromagnetic device and improved cooling method
FERROFLUIDICS CORP44 citations92
US4830384AMay 16, 1989
Compact long-life magnetic fluid seal
FERROFLUIDICS CORP29 citations92
US4824122AApr 25, 1989
Compact magnetic fluid low pressure seal
FERROFLUIDICS CORP35 citations92
US4797013AJan 10, 1989
Compact ferrofluidic electrically conducting sealed bearing
FERROFLUIDICS CORP39 citations92
US4732706AMar 22, 1988
Method of preparing low viscosity, electrically conductive ferrofluid composition
FERROFLUIDICS CORP46 citations92
US4687596AAug 18, 1987
Low viscosity, electrically conductive ferrofluid composition and method of making and using same
FERROFLUIDICS CORP52 citations92
US4575102AMar 11, 1986
Coaxial, multiple-shaft ferrofluid seal apparatus
FERROFLUIDICS CORP40 citations92
US4527805AJul 9, 1985
High-pressure ferrofluid seal apparatus
FERROFLUIDICS CORP34 citations92
US4526382AJul 2, 1985
Radially polarized multiple-stage ferrofluid seal apparatus
FERROFLUIDICS CORP31 citations92
US4502700AMar 5, 1985
Ferrofluid linear seal apparatus
FERROFLUIDICS CORP32 citations92
US5851416ADec 22, 1998
Stable polysiloxane ferrofluid compositions and method of making same
FERROFLUIDICS CORP21 citations91
US5474302ADec 12, 1995
On-site fillable ferrofluidic seal
FERROFLUIDICS CORP22 citations91
US4817964AApr 4, 1989
Ferrofluid exclusion seal and method of assembly
FERROFLUIDICS CORP36 citations91
US4692826ASep 8, 1987
Bearing assembly with integrated ferrofluid seal
FERROFLUIDICS CORP44 citations91
US4663128AMay 5, 1987
Pulling head for a crystal growing furnace
FERROFLUIDICS CORP29 citations91
US4628384ADec 9, 1986
Bearing assembly with integrated ferrofluid seal
FERROFLUIDICS CORP46 citations91
US4444398AApr 24, 1984
Self-activating ferrofluid seal apparatus and method
FERROFLUIDICS CORP42 citations91
US4407508AOct 4, 1983
Single-pole-piece ferrofluid seal apparatus and exclusion seal system
FERROFLUIDICS CORP54 citations91
US4252353AFeb 24, 1981
Self-activating ferrofluid seals
FERROFLUIDICS CORP34 citations91
US3977739AAug 31, 1976
Magnetic ball bearing assembly using ferrolubricants
FERROFLUIDICS CORP64 citations91
US6242994B1Jun 5, 2001
Apparatus to reduce push back time in solenoid valves
FERROFLUIDICS CORP31 citations90
US4407518AOct 4, 1983
Nonbursting multiple-stage ferrofluid seal and system
FERROFLUIDICS CORP41 citations90
US4350557ASep 21, 1982
Method for circumferential dimension measuring and control in crystal rod pulling
FERROFLUIDICS CORP42 citations90
US4350560ASep 21, 1982
Apparatus for and method of handling crystals from crystal-growing furnaces
FERROFLUIDICS CORP92 citations90
US4200296AApr 29, 1980
Ferrofluid centrifugal seal
FERROFLUIDICS CORP33 citations90
US4123675AOct 31, 1978
Inertia damper using ferrofluid
FERROFLUIDICS CORP51 citations90
US4445696AMay 1, 1984
Nonbursting magnetic liquid seals for high vacuum applications
FERROFLUIDICS CORP38 citations89
US4315827AFeb 16, 1982
Low-vapor-pressure ferrofluids and method of making same
FERROFLUIDICS CORP42 citations89
US5242667ASep 7, 1993
Solid pellet feeder for controlled melt replenishment in continuous crystal growing process
FERROFLUIDICS CORP42 citations88
US5594241AJan 14, 1997
Apparatus and method for jitter attenuation in rotary encoders
FERROFLUIDICS CORP26 citations86
Showing the top 50 of 84 patents by PatentIndex Score.