...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 5810737 | Chronotherapy exercise technique A chronotherapy exercise technique for treating a patient whose abnormal condition, regardless of its nature or origin, is reflected by a heart rate variability (HRV) that is reduced and deviates from an HRV reflecting a normal condition. In this treatmen... | 09/22/1998 |
| 5163439 | Rhythmic biofeedback technique An exercise technique having therapeutic effects. In this technique the heart rate of the individual being treated is continuously monitored and the prevailing rate is displayed as he undergoes a conditioning session constituted by successive stress-relax... | 11/17/1992 |
| 5007430 | Rhythmic biofeedback technique A rhythmic biofeedback technique for inducing relaxation to counteract the adverse physiological and psychological effects of chronic stress on an individual. In this technique, the heart beat of the individual being treated is continuously monitored and ... | 04/16/1991 |