DAVID W JOHNSON
Broker in Shrewsbury, MA

License number
Massachusetts 91400
Issued Date
Dec 1, 1975
Expiration Date
May 2, 2017
Type
Broker
Address
Address
Shrewsbury, MA 01545
LicenseFiles verified this license of Nov 25, 2016 at the Mass.gov - Consumer Affairs and Business Regulation.

Professional information

David Johnson Photo 1

Valve Assembly And Disassembly Device

US Patent:
4390039, Jun 28, 1983
Filed:
Sep 20, 1982
Appl. No.:
6/420382
Inventors:
David A. Johnson - Shrewsbury MA
Joseph B. Wright - Northboro MA
Michael Pashoogian - Worcester MA
Assignee:
Jamesbury Corporation - Worcester MA
International Classification:
F16K 4300, F16K 2500
US Classification:
137315
Abstract:
A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top surface of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90. degree. causing the seat to be pushed back by the larger diameter of the pin.

David Johnson Photo 2

Valve Assembly And Disassembly Device

US Patent:
4388945, Jun 21, 1983
Filed:
Jan 4, 1982
Appl. No.:
6/336686
Inventors:
David A. Johnson - Shrewsbury MA
Joseph B. Wright - Northboro MA
Michael Pashoogian - Worcester MA
Assignee:
Jamesbury Corporation - Worcester MA
International Classification:
F16K 4300, F16K 2500
US Classification:
137315
Abstract:
A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top entry of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90. degree. causing the seat to be pushed back by the larger diameter of the pin.

Broker licenses in Massachusetts