Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7758051 | Gas seal assembly A gas seal assembly includes a pair of mutually rotatable sealing members, each of which has a front face adjacent a gap between the two members which constitutes a leakage path through the seal assembly. The two sealing member are urged, in use, in a direction to c... | 07/20/2010 |
| 7252291 | Mechanical seal having a single-piece, perforated mating ring A mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) with reduced contact surface temperature, reduced contact surface wear, or inc... | 08/07/2007 |
| 7249768 | Shaft seal assembly and method A pressure-actuated shaft seal assembly and associated method for controlling the flow of fluid adjacent a rotatable shaft are provided. The seal assembly includes one or more seal members that can be adjusted between open and closed positions, for example, accordin... | 07/31/2007 |
| 7222861 | Sealing in a hydraulic turbine unit System for providing sealing between a rotor and a turbine casing in a hydraulic turbomachine includes a sealing ring arranged in a peripheral region of the rotor. The sealing ring forms at least one hydrostatic bearing with respect to at least one of the rotor and ... | 05/29/2007 |
| 7201238 | Low friction face sealed reaction turbine rotors Rotary jetting tool including a rotor with axially-opposed pressure-balanced mechanical face seals. Vented upper mechanical face seal enables the rotor to be operated with the relativity low starting torque achievable using reaction forces from offset jets energized... | 04/10/2007 |
| 7201241 | Self relieving seal Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal... | 04/10/2007 |
| 7198456 | Floating head reaction turbine rotor with improved jet quality A rotary jetting tool including a pressure-balanced rotor, which is achieved using a vented volume. Axial movement of the rotor relative to the housing caused by pressure imbalances acting on the rotor selectively uncovers or opens a vent that places the volume in f... | 04/03/2007 |
| 7144016 | Dry gas seal A gas seal assembly comprises a pair of mutually rotatable sealing members A, B, each of which has a face adjacent a gap between the two members. One of the members B is urged in a direction attempting to close the gap h which constitutes a leakage path through the ... | 12/05/2006 |
| 7112033 | Hygienic mechanical seal flushing system for pure liquids in sanitary centrifugal pumps A sanitary centrifugal pump with a hygienic mechanical seal flushing system. The pump has a housing with a pumping chamber defined therein. An impeller is at least partially contained in the housing and is connected to a shaft for rotation. The rotation of the impel... | 09/26/2006 |
| 7066469 | Seal assembly for machinery housing A seal assembly for a machinery housing includes a seal ring having a micro heat exchanger and a gland plate for securing the seal ring to the machinery housing. The gland plate includes a cooling fluid port in communication with the micro heat exchanger. ... | 06/27/2006 |
| 7044470 | Rotary face seal assembly A rotary seal assembly including a first member having a sealing face and a second member having a sealing face with a number of pumping grooves therein. At least a first set of pumping grooves stating proximate a center portion of the sealing face and extending out... | 05/16/2006 |
| 7014192 | Multistage shaft sealing apparatus A plurality of seal units are provided between a seal housing and a rotating shaft. An inside seal unit, an outside seal unit, and at least one pair of intermediate seal units are aligned in an axial direction. The inside seal unit contacts fluid to be sealed. The o... | 03/21/2006 |
| 6997601 | Agitator with removable blades for sanitary tank A sanitary tank is provided with a clean-in-place agitator assembly in which the impeller portion is removably installed at the tip or the shaft or along the shaft. A shaft housing that penetrates the wall of the tank employs lip seals around the drive shaft so that... | 02/14/2006 |
| 6976548 | Self relieving seal Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal... | 12/20/2005 |
| 6969236 | Fluid-cooled mechanical face seal rotor A fluid-cooled seal rotor is described for a seal assembly that includes a seal case, a seal stator, and wherein the rotor has a sealing face on a first side and a heat-transfer structure on a second side. The heat-transfer structure may be a roughened surface. The ... | 11/29/2005 |
| 6959929 | Seal for a compressor and centrifugal compressor equipped with such a seal A seal for a rotary compressor comprises a casing, at least one assembly having a rotating seal face ring which rotates as one with a sleeve intended to be mounted on a shaft of the compressor and of a stationary seal face ring mounted on the casing, the seal face r... | 11/01/2005 |
| 6942219 | Mechanical seal having a double-tier mating ring An apparatus and method to enhance the overall performance of mechanical seals in one of the following ways: by reducing seal face wear, by reducing the contact surface temperature, or by increasing the life span of mechanical seals. The apparatus is a mechanical se... | 09/13/2005 |
| 6814668 | Universal joint with venting seal assembly A universal joint includes a pair of bifurcated yokes interconnected by a cruciform. The cruciform includes four orthogonal trunnions each including a lubricant passage. A seal includes a plurality of protrusions engaging a portion of the trunnion to provide a purgi... | 11/09/2004 |
| 6705844 | Dynamic seal A seal is disposed between a rotating part and a stationary part. At least one of the parts is provided with projections which protrude into the seal gap. The seal gap (5) extends approximately radially so that both parts are provided with projections which e... | 03/16/2004 |
| 6666457 | Sealing device for sealing a cavity rotatable about a rotation axis A sealing device for sealing a cavity (40) rotatable around a rotational axis (A) includes at least two sealing areas separated from each other by at least one intermediate zone (Z1 to Z3), two sealing faces (20, 21 to 24, 30, 31 to 33, 41, 71 to 74) cont... | 12/23/2003 |
| 6557856 | Split mechanical face seal A split mechanical face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal face. The seal ring faces of the seal rings are ... | 05/06/2003 |
| 6494460 | Rotary barrier face seal Rotary barrier face seal of the non-contact type seal with helical grooves for a housing and a shaft, comprising means for introduction of an external barrier fluid towards the sealing interface. Said barrier fluid prevents sealed process fluid from enter... | 12/17/2002 |
| 6439577 | Rotating seals for cell processing systems The invention provides an improved rotating seal apparatus including a plurality of concentrically spaced annular rotating seals. The invention also provides a rotating seal apparatus including a pressurized annular chamber surrounding an annular rotating... | 08/27/2002 |
| 6431551 | Non-contact type mechanical seal A non-contact-type mechanical seal that keeps a rotary seal ring 6 from vibrating in what is called a pneumatic hammer fashion. For this purpose, an annular space 23 is formed between an outer circumferential surface 21a of the rotary seal ring 6 and an i... | 08/13/2002 |
| 6386547 | Dual non-contacting mechanical face seal having concentric seal faces A mechanical seal for providing fluid sealing between a housing and a rotatable shaft includes a first seal ring having a first seal face and a second seal ring having a second seal face. The first seal face further has a first portion and a second portio... | 05/14/2002 |
| 6338490 | Sealing arrangement with automatic clearance adjustment The seal is composed of butt-jointed segments (1) in which the bearing surface (18) on a rotating part (2) subject to wear, includes a hollow chamber (20) communicating through calibrated orifices (22) with a high pressure containment (8). Therefore, it f... | 01/15/2002 |
| 6233772 | Carbon dioxide cleaning apparatus with rotating basket and external drive A cleaning apparatus adapted for cleaning fabrics, garments and the like with a carbon dioxide cleaning medium comprises a wash vessel having a wall portion; a rotating basket positioned in the wash vessel; a drive shaft penetrating the wash vessel wall p... | 05/22/2001 |
| 6227547 | High pressure rotary shaft sealing mechanism A laterally translatable pressure staged rotary shaft sealing mechanism having a seal housing with a shaft passage therein being exposed to a fluid pressure P1 and with a rotary shaft being located within the shaft passage. At least one annular laterally ... | 05/08/2001 |
| 6213473 | Double gas seal with coplanar pad faces A double gas pressure seal 10 is provided for sealing between a stationary housing 14 and a rotary housing 26. The gas pressure seal includes a stationary ring 42 and a rotary ring 40 each having a radially inner sealing face and a radially outer sealing ... | 04/10/2001 |
| 6145843 | Hydrodynamic lift seal for use with compressible fluids This invention discloses a completely different hydrodynamic gas seal configuration from both the Rayleigh bearing and other prior art. Instead of the shallow, wide, and short single pocket geometry for the Rayleigh bearing, and instead of the multiple de... | 11/14/2000 |
| 6135458 | Static pressure non-contact gas seal A static pressure-type generating non-contact gas seal in which a diameter d2 of a second outer circumferential portion (42) of a stationary seal ring (4) in contact with a second O-ring (62) is made smaller than the diameter d1 of a first outer circumfer... | 10/24/2000 |
| 6116609 | Fluidic feedback pressure regulation system for a mechanical seal A fluidic feedback pressure regulation system employs one or more fluids within a mechanical seal to control one or more other fluids. The system includes a fluid manifold and a movable differential pressure valve, both of which are completely mounted wit... | 09/12/2000 |
| 6109617 | Gas seal assembly and method of sealing A gas seal assembly which in one embodiment comprises a seal ring having a plurality of annularly spaced-apart geometric impressions which cooperate with another seal ring having an annular groove into which opens a plurality of fluid pathways, the pathwa... | 08/29/2000 |
| 6076830 | Dual non-contacting mechanical face seal having concentric seal faces A mechanical seal for providing fluid sealing between a housing and a rotatable shaft includes a first seal ring having a first seal face and a second seal ring having a second seal face. The first seal face further has a first portion and a second portio... | 06/20/2000 |
| 6068263 | Split mechanical face seal with resilient pivoting member A split mechanical face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal surface. The seal ring surfaces of the seal ring... | 05/30/2000 |
| 6068264 | Split mechanical face seal with negative pressure control system A split mechanical face seat that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal surface. The seal ring surfaces of the seal ring... | 05/30/2000 |
| 6059293 | Split mechanical face seal with seal face fluid introducing structure A split face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal face. The seal ring faces of the seal rings are opposed to ... | 05/09/2000 |
| 5941532 | Aerospace housing and shaft assembly with noncontacting seal An aerospace housing and shaft assembly comprising a housing, a shaft rotatably mounted within the housing, a seal assembly operatively positioned between the housing and the shaft, and low pressure air (e.g., atmospheric air) having a pressure substantia... | 08/24/1999 |
| 5639096 | Oil film cooled face seal Disclosed is an oil film cooled face seal that is comprised of an annular stator having a flat surface in rubbing contact with the flat sealing surface of a rotor. The rotor has a flange portion extending radially from a base portion. The base portion has... | 06/17/1997 |
| 5464227 | Seal assembly for a rotary machine A seal assembly 46 for a rotary machine 10 is disclosed. Various construction details are developed which block the migration of oil from a compartment such as a bearing compartment 22. In one detailed embodiment, an annular clearance gap G is provided wi... | 11/07/1995 |
