Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1991-08-05
1994-01-18
Dwyer, James L.
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
379103, H04M 1100
Patent
active
052805182
ABSTRACT:
An electronic real estate lockbox system includes a number of operational features, including facsimile reporting capability, bilateral locking solenoids, improved shackle latching capabilities, improved key-compartment release operation, two-wire bilateral lock-key communications, improved case design, viral lockout list propagation, an update code grace period, packet formatted data transmission with error recovery, FSK audio data downloading, and high security challenge-response authorization procedures. A variety of other operational features are also disclosed.
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Babler David
Chapin Ron M.
Danler Richard W.
Kniffin John M.
Reviea Kenneth L.
Dwyer James L.
Matar Ahmad F.
Supra Products, Inc.
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