Visual indicator
US4799383A · kind A · utility
7Cited by
30References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Mar 31, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/164
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gauge or indicator (20) for providing a positive on/off visual indication comprises a lens (22) and a transition mount (24) with a resilient diaphragm (32) secured therebetween to define a sealed chamber therein. The chamber is filled with an opaque liquid (34) and a contrasting plug (36) which is secured to the diaphragm (32) and movable therewith responsive to an actuator stem (38) between an "off" position obscured by the liquid and an "on" position wherein the plug is visible behind the lens (22) upon displacement of the liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.