Henderson, Walter G.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Henderson, Walter G..The latest application filed is for "electronic real estate lockbox system".
- Henderson, Walter G. - Salem OR
- Henderson; Walter G. - Corvallis OR
| Patent | Date |
|---|---|
| Electronic real estate lockbox system App 20050168320 - Henderson, Walter G. ; et al. | 2005-08-04 |
| Dual mode data logging Grant 6,842,105 - Henderson , et al. January 11, 2 | 2005-01-11 |
| Secure entry system with radio reprogramming Grant 6,822,553 - Henderson , et al. November 23, 2 | 2004-11-23 |
| Data synchronization method for use with portable, microprocessor-based device Grant 5,602,536 - Henderson , et al. February 11, 1 | 1997-02-11 |
| Secure entry system with acoustically coupled telephone interface Grant 5,245,652 - Larson , et al. September 14, 1 | 1993-09-14 |
| Electronic real estate lockbox system with improved reporting capability Grant 5,046,084 - Barrett , et al. September 3, 1 | 1991-09-03 |
| Keysafe system with timer/calendar features Grant 4,988,987 - Barrett , et al. * January 29, 1 | 1991-01-29 |
| Electronic security system with configurable key Grant 4,947,163 - Henderson , et al. August 7, 1 | 1990-08-07 |
| Electronic lock system with battery conservation features Grant 4,929,880 - Henderson , et al. May 29, 1 | 1990-05-29 |
| Electronic key with interactive graphic user interface Grant 4,914,732 - Henderson , et al. April 3, 1 | 1990-04-03 |
| Electronic lock with energy conservation features Grant 4,896,246 - Henderson , et al. January 23, 1 | 1990-01-23 |
| Electronic lock system with improved data dissemination Grant 4,887,292 - Barrett , et al. * December 12, 1 | 1989-12-12 |
| Electronic real estate lockbox system Grant 4,766,746 - Henderson , et al. August 30, 1 | 1988-08-30 |
| Electronic real estate lockbox system Grant 4,727,368 - Larson , et al. February 23, 1 | 1988-02-23 |
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