ROBERT JOHN PRISTAS, JR
Pilots at Crocker Blvd, Concord Township, OH
License number
Ohio A5186764
Issued Date
Jun 2014
Expiration Date
Jun 2019
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
508 Crocker Blvd, Concord Township, OH 44024
Professional information
Method Of Making A Water Treatment Composite Pressure Vessel
US Patent:
7354495, Apr 8, 2008
Filed:
Nov 14, 2005
Appl. No.:
11/273407
Inventors:
Thomas G. Carter - Kent OH, US
Robert J. Pristas - Chardon OH, US
Robert J. Pristas - Chardon OH, US
Assignee:
Enpress, L.L.C. - Eastlake OH
International Classification:
B65H 81/00
US Classification:
156172, 156169, 156192
Abstract:
A composite pressure vessel includes an endcap with first and second layers. The first layer is a thermoplastic layer and the second layer is a thermoplastic and glass fiber composite layer. A method for making the vessel includes placing commingled thermoplastic and glass fibers in a heated mold to melt the thermoplastic. The molten thermoplastic and the glass fibers are molded into the endcap shape. An outer surface of the pressure vessel is finished in accordance with another aspect of the invention. A pressurizable bladder with an inwardly facing surface is deflated. The outer surface of the vessel is heated to soften the thermoplastic. The pressure vessel is positioned in the bladder so that the inwardly facing surface of the bladder is adjacent to an outer surface of the pressure vessel. The bladder is pressurized to move the bladder inwardly into contact with the adjacent surfaces to each other.
Hydropneumatic Filament-Wound Pressure Vessel
US Patent:
5484079, Jan 16, 1996
Filed:
Mar 13, 1995
Appl. No.:
8/402920
Inventors:
Thomas G. Carter - Kent OH
Douglas M. Horner - Gates Mills OH
Robert L. Zimmerman - Cleveland OH
Robert J. Pristas - Chardon OH
James C. Murphy - Chardon OH
Douglas M. Horner - Gates Mills OH
Robert L. Zimmerman - Cleveland OH
Robert J. Pristas - Chardon OH
James C. Murphy - Chardon OH
Assignee:
Essef Corporation - Chardon OH
International Classification:
F16L 5504
US Classification:
220589
Abstract:
A hydropneumatic filament-wound pressure vessel is disclosed. The vessel has first and second cup-shaped tank liners having circular open mouths which are provided with a seal and diaphragm assembly. The seal assembly includes a pocket formed by an inner wall and shelf associated with the first liner and a ledge associated with the second liner. The shelf, ledge and cylindrical wall cooperate with an inner surface of the second liner to provide an O-ring pocket. An O-ring is provided in the pocket and the O-ring defines the periphery of a flexible diaphragm which divides the interior of the liners into separate pressure chambers. A continuous filament is wound over the surface of the liners in an isotensoid pattern. Each liner has a geodesic dome surface extending between a diameter of the liner and a polar opening. The dome surface is defined by oppositely curving surfaces of revolution of a meridia joined by an inflection point.
Composite Pressure Vessel Assembly And Method
US Patent:
2003011, Jun 19, 2003
Filed:
Oct 10, 2002
Appl. No.:
10/268823
Inventors:
Thomas Carter - Kent OH, US
Robert Pristas - Chardon OH, US
Robert Pristas - Chardon OH, US
Assignee:
POLYMER & STEEL TECHNOLOGIES HOLDING COMPANY, L.L.C. - Eastlake OH
International Classification:
F17C001/02
US Classification:
220/586000
Abstract:
A composite pressure vessel includes an endcap with first and second layers. The first layer is a thermoplastic layer and the second layer is a thermoplastic and glass fiber composite layer. A method for making the vessel includes placing commingled thermoplastic and glass fibers in a heated mold to melt the thermoplastic. The molten thermoplastic and the glass fibers are molded into the endcap shape. An outer surface of the pressure vessel is finished in accordance with another aspect of the invention. A pressurizable bladder with an inwardly facing surface is deflated. The outer surface of the vessel is heated to soften the thermoplastic. The pressure vessel is positioned in the bladder so that the inwardly facing surface of the bladder is adjacent to an outer surface of the pressure vessel. The bladder is pressurized to move the bladder inwardly into contact with the adjacent surfaces to each other.
Composite Pressure Vessel Assembly
US Patent:
7810670, Oct 12, 2010
Filed:
Feb 22, 2008
Appl. No.:
12/035575
Inventors:
Thomas G. Carter - Kent OH, US
Robert J. Pristas - Chardon OH, US
Robert J. Pristas - Chardon OH, US
Assignee:
Enpress, L.L.C. - Eastlake OH
International Classification:
B65D 90/02
US Classification:
220565, 220567, 220 6222
Abstract:
A composite pressure vessel includes an endcap with first and second layers. The first layer is a thermoplastic layer and the second layer is a thermoplastic and glass fiber composite layer. A method for making the vessel includes placing commingled thermoplastic and glass fibers in a heated mold to melt the thermoplastic. The molten thermoplastic and the glass fibers are molded into the endcap shape. An outer surface of the pressure vessel is finished in accordance with another aspect of the invention. A pressurizable bladder with an inwardly facing surface is deflated. The outer surface of the vessel is heated to soften the thermoplastic. The pressure vessel is positioned in the bladder so that the inwardly facing surface of the bladder is adjacent to an outer surface of the pressure vessel. The bladder is pressurized to move the bladder inwardly into contact with the adjacent surfaces to each other.
Housing For Reverse Osmosis Filter Cartridge And Method Of Forming Same
US Patent:
8486264, Jul 16, 2013
Filed:
Jan 16, 2013
Appl. No.:
13/742993
Inventors:
Douglas M. Horner - Gates Mills OH, US
Michael P. Mormino - Auroa OH, US
Robert John Pristas - Chardon OH, US
Michael P. Mormino - Auroa OH, US
Robert John Pristas - Chardon OH, US
Assignee:
Enpress, LLC - Eastlake OH
International Classification:
B01D 27/08, B01D 63/06
US Classification:
210232, 2103216, 21032172, 210450, 210451, 210457, 210485
Abstract:
Housings for reverse osmosis filter cartridges and methods of making the same. The housings include: (1) a hollow cylindrical liner formed of a thermoplastic polymer that is adapted to surround a reverse osmosis filter cartridge; (2) a hollow head assembly that includes a transition collar portion formed of a thermoplastic polymer that is joined to said liner and a barrel portion formed of a chopped glass fiber-filled polymer that is overmolded onto said transition collar portion; (3) an end plug that is adapted to be received within an opening in the barrel portion; and (4) an overwrap layer comprising wound glass filaments and a polymeric resin that covers the outer surfaces of the liner and head assembly.
Housing For Reverse Osmosis Filter Cartridge And Method Of Forming Same
US Patent:
8377298, Feb 19, 2013
Filed:
Feb 10, 2010
Appl. No.:
12/703464
Inventors:
Douglas S. Stolarik - Mentor OH, US
Douglas M. Horner - Gates Mills OH, US
Michael P. Mormino - Aurora OH, US
Robert John Pristas - Chardon OH, US
Douglas M. Horner - Gates Mills OH, US
Michael P. Mormino - Aurora OH, US
Robert John Pristas - Chardon OH, US
Assignee:
Enpress, LLC - Eastlake OH
International Classification:
B01D 63/06, B01D 27/08, B29C 53/62, B29C 65/06
US Classification:
210232, 2103216, 21032172, 210450, 210451, 210457, 210485, 156 735, 156169, 264248
Abstract:
Housings for reverse osmosis filter cartridges and methods of making the same. The housings include: (1) a hollow cylindrical liner formed of a thermoplastic polymer that is adapted to surround a reverse osmosis filter cartridge; (2) a hollow head assembly that includes a transition collar portion formed of a thermoplastic polymer that is joined to said liner and a barrel portion formed of a chopped glass fiber-filled polymer that is overmolded onto said transition collar portion; (3) an end plug that is adapted to be received within an opening in the barrel portion; and (4) an overwrap layer comprising wound glass filaments and a polymeric resin that covers the outer surfaces of the liner and head assembly.