1
Walter G Henderson, John Q Archer II, Gerald R Daum, George A Ellson, John E Gray, Wayne F Larson, Rockne M Olds, Jerry P Scansen, John W Sherman, Edgar J Unrein: Electronic key with interactive graphic user interface. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, April 3, 1990: US04914732 (179 worldwide citation)

An electronic key for an electronic lock system is provided with graphical user interface which can display a plurality of symbols corresponding to a plurality of functions that the key can cause the lock to execute. An operator of the key moves a visual indicia among these symbols to select a desir ...


2
Wayne F Larson, Walter G Henderson: Electronic real estate lockbox system. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, February 23, 1988: US04727368 (136 worldwide citation)

Real estate lockbox and key designs are disclosed which provide a variety of operational features. Also disclosed is a comprehensive system that allows real estate boards and agencies to efficiently manage their lockbox operations. Features provided by the system include the ability to record all ac ...


3
Walter G Henderson, John Q Archer II, Gerald R Daum, George A Ellson, John E Gray, Wayne F Larson, Rockne M Olds, Jerry P Scansen, John W Sherman, Edgar J Unrein: Electronic real estate lockbox system. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, August 30, 1988: US04766746 (98 worldwide citation)

A comprehensive real estate lockbox system is disclosed which provides a variety of operational features. Some of these features include the ability to: record all accesses to all lockboxes; transfer all or part of such records from the lockboxes to a supervising real estate agency or board; organiz ...


4
Walter G Henderson, Wayne F Larson, Philip D Barrett: Data synchronization method for use with portable, microprocessor-based device. Supra Products, Stoel Rives, February 11, 1997: US05602536 (89 worldwide citation)

One or more lock or key units of a secure entry system is equipped with a radio receiver. The receiver permits a memory in the lock or key unit to be updated with new data that is modulated onto a radio frequency signal. By this technique, system-wide changes of programming data, such as changes of ...


5
Martin A Barrett, Wayne F Larson: Electronic access control systems. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, December 12, 1995: US05475375 (85 worldwide citation)

An access control system provides a database in an access control device (i.e. key) and includes procedures assuring that the database, and a master database, are kept up to date. In the particular context of a real estate lockbox system, the keys are provided with a database detailing houses listed ...


6
Richard W Danler, John W Sherman, David Babler, Ron M Chapin, John M Kniffin, Kenneth L Reviea, Lynn L Schreiner: Electronic security system. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, January 18, 1994: US05280518 (84 worldwide citation)

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 des ...


7
Philip D Barrett, Walter G Henderson, Wayne F Larson: Keysafe system with timer/calendar features. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, January 29, 1991: US04988987 (81 worldwide citation)

An electronic lock system is disclosed in which a key can be assigned a limited lifetime, such as by storing data indicative of an expiration date in a key memory. Whenever the key is used with a lock, the lock first examines this key data and verifies that the key is still timely before performing ...


8
John M Kniffin, Ron McCauley, Ralph H Wells III, John W Sherman, Wayne F Larson: Access control device featuring key ordering or key simultaneity. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, January 6, 1998: US05705991 (67 worldwide citation)

A secure entry system makes use of radio transmissions to communicate with locks, keys, and related components throughout the system. The radio transmissions can be made using a paging system, a cellular telephone system, or any other RF carrier. Some embodiments employ a cellular telephone in lieu ...


9
Martin A Barrett, Wayne F Larson: Method for transferring auxillary data using components of a secure entry system. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, August 5, 1997: US05654696 (65 worldwide citation)

Improvements to access control systems include the provision of a database in an access control device (i.e. key) and procedures assuring that the database, and a master database, are kept up to date. In the particular context of a real estate lockbox system, the keys are provided with a database de ...


10
Philip D Barrett, Gerald R Daum, Wayne F Larson: Method and apparatus for compiling data relating to operation of an electronic lock system. Supra Products, Klarquist Sparkman Campbell Leigh & Whinston, April 10, 1990: US04916443 (64 worldwide citation)

A key is provided with a memory in which, without user intervention, it collects data relating to lock operations each time the key interacts with a lock. This data is subsequently downloaded from the key to a computer. In some embodiments, the keys collect data relating not just to their own transa ...