Air bubble free compass and method of manufacturing same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 28, 1995
Grant Date -
N/A
app pub date -
Nov 4, 1994
filing date -
Nov 4, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of preventing air bubbles in a compass equipped with fluid expansion capability, wherein a compass unit is assembled with a fluid expansion diaphragm; the compass unit is filled with fluid expanding the diaphragm, and sealed while maintaining the diaphragm in its expanded state for preventing air bubbles in reduced pressure and/or reduced temperature conditions, without significantly changing the basic structure of the compass.
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Cited Art Landscape
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