Career records & work history
Medicine Doctors
John Douglas Maples
Specialties:
Emergency Medicine
John N Maples, 765452 Highway 157 N, Pleasant Plains, AR 72568
John Maples Phones & Addresses
5452 Highway 157 N, Pleasant Plains, AR 72568
Pleasant Plns, AR
Newport, AR
Montgomery, TX
Richmond, TX
Wharton, TX
Brandon, MS
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Publications & IP owners
Us Patents
Pipe Connection
US Patent:
4253687, Mar 3, 1981
Filed:
Jun 11, 1979
Appl. No.:
6/047299
Inventors:
John H. Maples - Houston TX
Assignee:
Whiting Oilfield Rental, Inc. - Houston TX
International Classification:
F16L 1500
US Classification:
2853323
Abstract:
Pipe connection comprising "Hydril" type pin and box connectors with an annular groove formed in the pin connector at the juncture of the inner cylindrical land and the inner tapered seating surface and a seal ring of preferably circular cross section, e. g. an O-ring, disposed in the groove sealing between the pin connector and the box connector.
Back Pressure Valve
US Patent:
4396035, Aug 2, 1983
Filed:
Jun 5, 1981
Appl. No.:
6/270840
Inventors:
John H. Maples - Houston TX
Assignee:
Whiting Oilfield Rental, Inc. - Houston TX
International Classification:
F16K 1504
US Classification:
137539
Abstract:
A back pressure valve includes a tubular body having pin and box connections at its outer ends and formed of two tubes connected by double step straight threaded connectors with a seat ring captured between the two tubes. A ball is urged against the seat ring by a helical compression spring. A triple slotted tubular spring support is screwed into the outlet portion of the body. A hex headed cylindrical post at the upper closed end of spring support fits snugly but slidably with the spring and centers the spring. The dimensions of the spring and spring support are such as to prevent the spring from buckling. The flow path through the slots and around the support is as large as that through the seat ring, which is about equal to that through the pin connectors of the body tubes, whereby the wall thickness of the pin connectors is large. The support can be removed with a socket wrench. A release tool can depress the ball off its seat to release fluid pressure.
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