| US 7,401,512 B2 | ||
| Solid state illuminator for bi-color ported water level gauges | ||
| David Kalix, Dartmouth (Canada); and John Spencer, Dartmouth (Canada) | ||
| Assigned to Fossil Steam Technologies Inc., Dartmouth, NS (Canada) | ||
| Filed on Feb. 12, 2007, as Appl. No. 11/704,935. | ||
| Application 11/056103 is a division of application No. 10/487868, granted, now 6,938,477, filed on Sep. 06, 2005, previously published as PCT/CA03/01684, filed on Nov. 03, 2003. | ||
| Application 11/704935 is a continuation of application No. 11/056103, filed on Feb. 14, 2005, granted, now 7,213,457. | ||
| Claims priority of application No. 2410978 (CA), filed on Nov. 04, 2002. | ||
| Prior Publication US 2007/0144252 A1, Jun. 28, 2007 | ||
| Int. Cl. G01F 23/00 (2006.01) | ||
| U.S. Cl. 73—293 | 37 Claims |
| 1. A liquid level gauge, comprising:
a housing having a first end and a second end;
a liquid column connected to the first end of the housing, the liquid column including a plurality of viewing ports; and
a light source connected to the second end of the housing, the light source including a plurality of light emitting diodes
(LEDs), half of the LEDs emitting a first color light and half of the LEDs emitting a second color light, at least one pair
of bi-color LEDs corresponding to each viewing port, and each pair of bi-color LEDs being oriented with respect to the corresponding
viewing port in such a way that the first color light passes through the corresponding viewing port when a liquid is present
in the corresponding viewing port and the second color light passes through the corresponding viewing port when a non-liquid
is present in the corresponding viewing port.
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