US PATENT SUBCLASS 137 / 454.6
.~ Retained by bonnet or closure


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



137 /   HD   FLUID HANDLING

454.2  DF  REMOVABLE VALVE HEAD AND SEAT UNIT {3}
454.6.~ Retained by bonnet or closure


DEFINITION

Classification: 137/454.6

(under subclass 454.2) Devices in which the unit is retained in position by a valve bonnet or access-opening closure.