Patents by Inventor Michael M. Calistrat

Michael M. Calistrat has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5789822
    Abstract: An electronic governor (34) to control a main steam valve (22) of a steam turbine (10) for controlling the rotational speed of a main drive shaft (16). The electronic governor (34) has a housing (36) in which an electric generator (104) is mounted to supply electrical energy to an electronic module (100) mounted on the housing (36). A hydraulic fluid pump (52) is mounted on the housing (36) and supplies fluid to a fluid operated piston (62) to effect a predetermined rotation of an output control shaft (32) and movement of main steam valve (22). Output signals from a microprocessor (116) to solenoid operated valves (96, 98) control the movement of fluid operated piston (62). Pump shaft (46) and generator shaft (48) are in axial alignment with and driven by the main drive shaft (16) to provide all of the power for operation of the electronic governor (34).
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: August 4, 1998
    Assignee: Revak Turbomachinery Services, Inc.
    Inventors: Michael M. Calistrat, Lynn A. Revak
  • Patent number: 5421702
    Abstract: A lubricant pump (24) for supplying pressurized lubricant to the main bearings (14) of a drive shaft (12) for a steam turbine (10) as shown in FIG. 1. A lubricant pump (24) is positioned between a governor (18) and an adjacent bearing (14) with the governor (18) and lubricant pump (24) being driven from the turbine shaft (12). The lubricant pump (24) has an outer housing (56) with a pair of opposed parallel mounting faces (58, 60) for mounting against a planar end face (48) of a bearing housing (44) on one side of lubricant pump (24) and an opposed planar face (38) of governor (18) on the other side of lubricant pump (24). Lubricant pump (24) comprises a rotary gear pump and may be easily installed on an existing turbine (10) having a governor (18) mounted on a bearing housing (44). Lubricant pump (24) includes gears ( 90, 92) to supply pressurized fluid through lubricant lines (30, 32) to bearings (14).
    Type: Grant
    Filed: April 6, 1994
    Date of Patent: June 6, 1995
    Assignee: Revak Turbomachinery Services, Inc.
    Inventors: Lynn A. Revak, Michael M. Calistrat
  • Patent number: 4437847
    Abstract: A flexible coupling in which the torque is transmitted by elastomeric elements held in compression. The coupling includes a sleeve assembly comprised of a plurality of independent arcuate elements and a retainer ring assembly which maintain the elastomeric elements in operable contact with the blades of the hub during rotation of the coupling.
    Type: Grant
    Filed: July 6, 1982
    Date of Patent: March 20, 1984
    Assignee: Koppers Company, Inc.
    Inventor: Michael M. Calistrat
  • Patent number: 4191030
    Abstract: An improved flexible diaphragm coupling including a floating shaft connector having flexible discs welded thereto, the flexible discs connected to axially spaced, coaxially aligned shaft mounted hubs, pilot rings surrounding the discs for aligning the assembly with the hubs and damper means fixed to the floating shaft and the pilot rings. The damper means which includes an elastomeric inner ring serves to dampen axial oscillations of the coupling assembly and seals the disc element from adverse contaminants.
    Type: Grant
    Filed: August 21, 1978
    Date of Patent: March 4, 1980
    Assignee: Koppers Company, Inc.
    Inventor: Michael M. Calistrat
  • Patent number: 4164855
    Abstract: Disclosed is an improved segmented driving shaft in which the torque is transmitted from roll segment to roll segment through flexible gear-type couplings. The shaft includes a plurality of alignment tubes which reduces the angle of misalignment of the gear-type couplings.
    Type: Grant
    Filed: August 9, 1978
    Date of Patent: August 21, 1979
    Assignee: Koppers Company, Inc.
    Inventor: Michael M. Calistrat
  • Patent number: 4004433
    Abstract: A continuously lubricated gear type coupling for connecting a pair of substantially co-axially aligned rotatable shafts comprising: a hub having outwardly extending gear teeth and secured to an end of one of the shafts by a key for rotation therewith; a sleeve surrounding the hub and having inwardly extending gear teeth in meshing engagement with the outwardly extending gear teeth and connected to the other shaft for rotation therewith; a plurality of inlet ports for continuously supplying a lubricant to the inwardly and outwardly meshing gear teeth; a plurality of outlet ports for removal of the lubricant from the coupling after the lubricant has lubricated the inwardly and outwardly extending gear teeth; and an annular impeller surrounding the one shaft and secured to the hub to direct the flow of air or corrosive gases away from the key and keyways of the coupling upon rotation thereof thereby preventing the air or corrosive gases from entering the coupling through the keyway and causing corrosion thereof.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: January 25, 1977
    Assignee: Koppers Company, Inc.
    Inventor: Michael M. Calistrat
  • Patent number: 3953986
    Abstract: A permanently sealed gear coupling for connecting a pair of substantially coaxially aligned rotatable shafts comprising a hub connected to each of the rotatable shafts, each of the hubs including outwardly extending spur gear teeth projecting from a portion of the outer surface thereof; a sleeve surrounding and radially spaced from each of the hubs, the sleeve having inwardly extending spur gear teeth in meshing engagement with the outwardly extending gear teeth on each hub; and permanently mounted sealing rings for retaining lubricant in spaces between the hubs and the sleeve for lubricating the meshing gear teeth.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: May 4, 1976
    Assignee: Koppers Company, Inc.
    Inventor: Michael M. Calistrat