Back to results
US 4,415,781 AGranted
Membrane switch
AssigneeW. H. Brady Co.
InventorsNorman J. Frame, James P. Walber, Jan M. Janick
Life of this patent
Estimating the term…
Abstract
A membrane switch in which switch activation produces a change in the combined resistance and capacitance across leads of the switch.
Claims10
A switch assembly comprising
- a flexible membrane supporting a first contact,
- a spacer layer positioned below said membrane for spacing it from a facing surface having a second contact aligned with said first contact,
- a capacitor and resistor electrically connected to said first and second contacts in series, and
- first and second electrical leads for connecting said contacts and said capacitor and resistor to external circuitry,
- whereby switch activation can be sensed by external circuitry connected to said leads by sensing a unique resistance and capacitance combination across said leads.
2 more elements
Dependencies are inferred from the claim text.