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3720938
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Information
Patent Grant
3720938
References
Source
Patent Number
3,720,938
Date Filed
Not available
Date Issued
Tuesday, March 13, 1973
52 years ago
CPC
H01H13/785 - characterised by the material of the contacts
B41J5/08 - Character or syllable selected by means of keys or keyboards of the typewriter type
B41J5/12 - Construction of key buttons
G06F11/085 - using codes with inherent redundancy
H01H13/70 - having a plurality of operating members associated with different sets of contacts
H01H13/702 - with contacts carried by or formed from layers in a multilayer structure
H03M11/22 - Static coding
H01H13/703 - characterised by spacers between contact carrying layers
H01H2201/03 - Composite
H01H2205/032 - Several contacts formed in one plate or layer
H01H2207/012 - via underside of substrate
H01H2209/006 - Force isolators
H01H2209/01 - Increasing rigidity Anti-creep
H01H2211/016 - Wires
H01H2217/016 - Pressure reduction membrane Spreader layer
H01H2225/018 - Consecutive operations
H01H2239/026 - Internal encoding
US Classifications
341 - Coded data generation or conversion
178 - Telegraphy
200 - Electricity: circuit makers and breakers
714 - Error detection/correction and fault detection/recovery
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