Quotables
"Without question, the greatest invention in the history of mankind is beer. Oh, I grant you that the wheel was also a fine invention, but the wheel does not go nearly as well with pizza."
Dave Barry
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6899338 | Ferrofluid seal incorporating multiple types of ferrofluid A ferrofluid seal apparatus incorporating a multi-stage ferrofluid rotary seal adapted to provide a ferrofluid pressure-type seal about a shaft element extending between a first environment and a second environment, a first magnetic fluid disposed at one stage of th... | 05/31/2005 |
| 6543782 | Non-bursting ferrofluid seal Magnetic fluid seals containing housings, magnets, pole pieces, gaps, magnetic fluids, shafts and bearings of standard type are modified to permit operation at two levels of magnetic intensity in the gaps. During exposure to the operating pressure differe... | 04/08/2003 |
| 6290894 | Ferrofluid sculpting apparatus Magnetic sculptures are formed by placing a ferrofluid in a shaped magnetic field. In response to the field, the ferrofluid forms fanciful sculptures as determined by the magnetic field lines. In one embodiment, a low viscosity and surface tension ferrofl... | 09/18/2001 |
| 6254781 | Method for recycling ferrofluid constituents used in a materials separation process Ferrofluid coated particles resulting from a ferrofluid materials separation process are washed with a solvent which is the same material as the liquid carrier employed in the ferrofluid. The result is a "dirty" solvent which is a very weak ferrofluid. Th... | 07/03/2001 |
| 6103107 | System for recycling ferrofluid constituents used in a materials separation process Ferrofluid coated particles resulting from a ferrofluid materials separation process are washed with a solvent which is the same material as the liquid carrier employed in the ferrofluid. The result is a "dirty" solvent which is a very weak ferrofluid. Th... | 08/15/2000 |
| 6068785 | Method for manufacturing oil-based ferrofluid A slurry is formed of particles of a non-magnetic oxide of iron (-Fe2 O3), an oil carrier liquid and a surfactant. The slurry is then processed in an attrition mill where kinetic energy is applied to the slurry to convert the ... | 05/30/2000 |
| 5958282 | Low cost method for manufacturing ferrofluid A ferrofluid manufacturing process applies energy to a nonmagnetic -Fe2 O3 starting material to render it magnetic and suitable for use in a ferrofluid. The material is placed, together with a solvent and a surfactant, in a co... | 09/28/1999 |
| 5955934 | Quiet ferrofluid solenoid with cushion A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic... | 09/21/1999 |
| 5908987 | Sensor employing a sliding ferrofluid mass in a coated, non-wetting, housing A ferrofluid sensor assembly includes a closed housing containing a movable inductance core material that is isolated from the inner walls of the housing by an isolating material. The isolating material forms a layer between the inductance core material a... | 06/01/1999 |
| 5851416 | Stable polysiloxane ferrofluid compositions and method of making same A ferrofluid composition comprising a colloidal dispersion of finely divided magnetic particles in a silicone oil carrier in which the surfaces of the magnetic particles are modified with (a) a first surfactant comprising a hydrocarbon having at least one... | 12/22/1998 |
| 5780741 | Sensor employing a sliding magnet suspended on ferrofluid A ferrofluid sensor assembly includes a permanent magnet which is supported in a hermetically-sealed housing by ferrofluid rings at each end of the magnet. However, the housing is large enough that the ferrofluid rings do not seal the end of the magnet ag... | 07/14/1998 |
| 5461677 | Loudspeaker A loudspeaker including one or more secondary magnets positioned proximate to an opening of a gap through which a voice coil moves, to capture escaping ferrofluid and return the fluid to the gap. The secondary magnets have axial poles and are oriented, re... | 10/24/1995 |
| 5429000 | Ferrofluid pressure sensor A differential pressure sensor includes a ferrofluid sensing element, or slug, that changes position in a tapered magnetic field in response to a pressure differential. The ferrofluid slug is contained in a tube and moves within the tapered magnetic field... | 07/04/1995 |
| 5018751 | Stacked pole-piece ferrofluid seal apparatus A long-life, stacked pole-piece magnetic fluid seal for sealing between a housing and magnetically permeable shaft, in one embodiment is comprised of an annular magnet, having poles of opposite polarity on first and second end surfaces thereof, an annular... | 05/28/1991 |
| 4927164 | Ferrofluid seal with epoxy pole pieces In a ferrofluid seal which comprises a magnet and at least one pole piece, the pole piece is fabricated from a ferromagnetic material which directly bonds to the magnet face. Since the pole piece material directly bonds to the magnet, no additional adhesi... | 05/22/1990 |
| 4898480 | Compact ferrofluidic electrically conducting sealed bearing A sealed, rolling element bearing includes an inner race attached to a shaft, an outer race attached to a housing, a plurality of rolling elements in an annular region and a pair of shields extending inwardly from the outer race toward the inner race so a... | 02/06/1990 |
| 4890850 | Tapered ferrofluid seal A ferrofluid seal wherin the amount of ferrofluid which may be used is increased by tapering the gap in which the ferrofluid is retained from one end of the gap to the other. One side of this gap is the magnet and, where used, pole pieces used to generate... | 01/02/1990 |
| 4865334 | Long-life multi-stage ferrofluid seals incorporating a ferrofluid reservoir A multi-stage ferrofluid seal incorporates a ferrofluid reservoir for extending seal life. The reservoir is located between seal stages and contains a quantity of ferrofluid sufficient to replace ferrofluid in the seal stages which is lost due to evaporat... | 09/12/1989 |
| 4830384 | Compact long-life magnetic fluid seal A compact long-life magnetic fluid seal for sealing between a housing and a magnetically permeable rotating shaft includes an annular magnet having a closely-spaced, noncontacting relationship with the shaft to define a first gap and an annular pole piece... | 05/16/1989 |
| 4824122 | Compact magnetic fluid low pressure seal A bearing and magnetic fluid seal assembly includes a shaft mounted by axially spaced-apart bearings for rotation relative to a housing. A magnetic fluid seal includes an annular magnet axially positioned between the bearings in the space that is wasted a... | 04/25/1989 |
| 4797013 | Compact ferrofluidic electrically conducting sealed bearing A sealed, rolling element bearing includes an inner race attached to a shaft, an outer race attached to a housing, a plurality of rolling elements in an annular region and a pair of shields extending inwardly from the outer race toward the inner race so a... | 01/10/1989 |
| 4772032 | Compact magnetic fluid low pressure seal A bearing and magnetic fluid seal assembly includes a shaft mounted by axially spaced-apart bearings for rotation relative to a housing. A magnetic fluid seal includes an annular magnet axially positioned between the bearings in the space that is wasted a... | 09/20/1988 |
| 4732706 | Method of preparing low viscosity, electrically conductive ferrofluid composition A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such... | 03/22/1988 |
| 4692826 | Bearing assembly with integrated ferrofluid seal A bearing assembly with an integrated single-stage ferrofluid seal incorporated therein, which assembly comprises: a bearing assembly having an inner and outer race to define a raceway and a plurality of rolling elements within the raceway to permit rotat... | 09/08/1987 |
| 4687596 | Low viscosity, electrically conductive ferrofluid composition and method of making and using same A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such... | 08/18/1987 |
| 4673997 | Electrically conductive ferrofluid bearing and seal apparatus and low-viscosity electrically conductive ferrofluid used therein An electrically conductive ferrofluid-film-bearing apparatus and seal apparatus for a shaft which employs a low-viscosity, electrically conductive ferrofluid composition, which composition comprises a liquid carrier, and contains in combination an electri... | 06/16/1987 |
| 4628384 | Bearing assembly with integrated ferrofluid seal A bearing assembly with an integrated single-stage ferrofluid seal apparatus incorporated therein, which assembly comprises a bearing assembly having an inner and outer race to define a raceway, a plurality of rolling elements retained within the raceway ... | 12/09/1986 |
| 4604229 | Electrically conductive ferrofluid compositions and method of preparing and using same An electrically conductive ferrofluid composition and a method of preparing and using the ferrofluid composition in a ferrofluid seal apparatus, and which ferrofluid composition comprises a liquid carrier having a colloidal dispersion of ferromagnetic par... | 08/05/1986 |
| 4604222 | Stable ferrofluid composition and method of making and using same A stable ferrofluid composition and the method of preparing and using the ferrofluid composition, such as in a ferrofluid seal apparatus, and which ferrofluid composition comprises: a liquid carrier; ferromagnetic particles sufficient to provide magnetic ... | 08/05/1986 |
| 4575102 | Coaxial, multiple-shaft ferrofluid seal apparatus A compact, coaxial multiple-shaft ferrofluid seal apparatus which comprises: a housing; a central shaft and magnetically permeable coaxial shafts about the central shaft, the coaxial shafts having a pair of spaced apart nonmagnetically permeable insulator... | 03/11/1986 |
| 4531846 | Compact ferrofluid seal and bearing assembly The compact ferrofluid seal and radial bearing assembly, particularly useful for the support and sealing of a shaft, such as a computer disk drive shaft, where space is at a premium, which assembly comprises a magnetically-permeable radial bearing apparat... | 07/30/1985 |
| 4527805 | High-pressure ferrofluid seal apparatus A high-pressure rotary seal apparatus with a radially-polarized permanent magnet, which seal apparatus comprises: a housing; a magnetically-permeable shaft to be sealed extending through the housing, the shaft characterized by a plurality of separate groo... | 07/09/1985 |
| 4526379 | Stabilized ferrofluid-ferrofluid seal apparatus and method A stabilized ferrofluid-ferrofluid interface seal apparatus and method, which method comprises forming a ferrofluid-ferrofluid seal interface between a magnetized ferrofluid O-ring seal and unmagnetized ferrofluid from a ferrofluid reservoir, and maintain... | 07/02/1985 |
| 4526380 | Single pole piece multiple-stage ferrofluid seal apparatus A single pole piece multiple-stage ferrofluid seal apparatus which comprises a non-permeable housing, an annular, axially polarized permanent magnet and a single pole piece on one side of the axially polarized permanent magnet and a magnetically permeable... | 07/02/1985 |
| 4526382 | Radially polarized multiple-stage ferrofluid seal apparatus A compact, low cost, radially polarized multiple-stage ferrofluid seal apparatus which comprises a magnetically permeable housing, a magnetically permeable shaft to be sealed extending through the housing, one or more radially polarized permanent magnets ... | 07/02/1985 |
| 4506895 | Self-activating ferrofluid seal apparatus and method of use A low-cost, self-activating ferrofluid seal apparatus particularly useful as an exclusion seal with computer-disc-drive spindles, which seal apparatus comprises an annular, axially-polarized permanent magnet and first and second pole pieces in a magnetic-... | 03/26/1985 |
| 4502700 | Ferrofluid linear seal apparatus A ferrofluid linear seal apparatus to provide a hermetic seal about a shaft engaged in linear motion between a first and second environment, typically between a vacuum atmosphere and atmospheric pressure, which seal apparatus comprises: a housing for a sh... | 03/05/1985 |
| 4478424 | Ferrofluid seal apparatus and method A ferrofluid seal apparatus and method, which ferrofluid seal apparatus comprises at least one ferrofluid seal about the surface of a rotatable shaft, the ferrofluid retained in a sealing relationship by magnetic flux from the ends of two pole pieces whic... | 10/23/1984 |
| 4445696 | Nonbursting magnetic liquid seals for high vacuum applications A single-stage, ferrofluid magnetic seal apparatus and method which comprises: an annular, permanent-magnet ring element adapted to surround a shaft to be sealed, which shaft extends between first low-pressure and second high-pressure; first and second po... | 05/01/1984 |
| 4407508 | Single-pole-piece ferrofluid seal apparatus and exclusion seal system A single-pole-piece ferrofluid exclusion seal apparatus and exclusion seal system which comprises a single, annular pole piece to surround a shaft element to be sealed, and an annular permanent magnet secured to one surface of the pole piece in a magnetic... | 10/04/1983 |
