Assignee
BELLOFRAM CORP
US15 patents
Top patents by PatentIndex Score
US4674526AJun 23, 1987
Switching valve
BELLOFRAM CORP57 citations94
US4729398AMar 8, 1988
Current-to-pressure transducers
BELLOFRAM CORP43 citations92
US4229010AOct 21, 1980
Self-aligning shaft seal
BELLOFRAM CORP38 citations90
US4208060AJun 17, 1980
Sealed shaft
BELLOFRAM CORP32 citations85
US3969991AJul 20, 1976
Rolling diaphragm and rolling diaphragm devices
BELLOFRAM CORP61 citations85
US4390036AJun 28, 1983
Rolling diaphragm vacuum control
BELLOFRAM CORP27 citations79
US4253675AMar 3, 1981
Improvements of sealed shafts
BELLOFRAM CORP20 citations79
US4466455AAug 21, 1984
Rolling diaphragm vacuum control with check valve
BELLOFRAM CORP10 citations71
US4263838AApr 28, 1981
Pneumatic positioner
BELLOFRAM CORP9 citations71
US4244589AJan 13, 1981
Sealed shaft of reduced diameter
BELLOFRAM CORP11 citations71
US4219042AAug 26, 1980
Pneumatic relay
BELLOFRAM CORP9 citations66
US4705458ANov 10, 1987
Fluid operated pump
BELLOFRAM CORP12 citations65
US4905720AMar 6, 1990
Current-to-pressure transducer with enhanced performance features
BELLOFRAM CORP2 citations62
US12504090B2Dec 23, 2025
Slam shut thermally triggered valve
BELLOFRAM CORP0 citations46
US11988299B2May 21, 2024
Slam shut thermally triggered valve
BELLOFRAM CORP0 citations46