Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
2005-09-06
2005-09-06
Lee, Kevin (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C137S391000, C137S557000, C137S558000, C141S095000, C073S291000, C073S299000, C700S281000, C702S055000, C340S618000, C340S626000, C340S870160
Reexamination Certificate
active
06938635
ABSTRACT:
The present invention comprises a novel level switch which may be employed to detect liquid levels within a process vessel. The level switch of the present invention is self validating so that manual testing is not required in order to ensure proper operation and switch calibration. The switch of the present invention may be easily introduced into existing process vessel designs as a replacement for prior art level detection switches with minimal or no retrofitting effort being required. The self validating level switch of the present invention may be connected to a Safety Instrumented System (SIS) such that process control including process shutdowns to avoid overfilling and low-fluid conditions may be accomplished.
REFERENCES:
patent: 3371534 (1968-03-01), Akeley
patent: 4111218 (1978-09-01), Hobbs
patent: 4265263 (1981-05-01), Hobbs
patent: 4386623 (1983-06-01), Funk et al.
patent: 4446730 (1984-05-01), Smith
patent: 4553216 (1985-11-01), Stevens et al.
patent: 4562858 (1986-01-01), Salina et al.
patent: 4602344 (1986-07-01), Ferretti et al.
patent: 4669309 (1987-06-01), Cornelius
patent: 4788648 (1988-11-01), Ferretti et al.
patent: 4956763 (1990-09-01), Stewart et al.
patent: 5351725 (1994-10-01), Suthergreen et al.
patent: 5604315 (1997-02-01), Briefer et al.
patent: 5827963 (1998-10-01), Selegatto et al.
patent: 5870695 (1999-02-01), Brown et al.
patent: 6082392 (2000-07-01), Watkins, Jr.
patent: 6157894 (2000-12-01), Hess et al.
patent: 6529845 (2003-03-01), Beck, II
patent: 2004/0149031 (2004-08-01), Bouchard
patent: 1384390 (1975-02-01), None
patent: WO 96/21845 (1996-07-01), None
patent: WO 01/92834 (2001-12-01), None
ExxonMobil Research and Engineering Company
Keen Malcolm D.
Lee Kevin
LandOfFree
Level switch with verification capability does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Level switch with verification capability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Level switch with verification capability will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3446069