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...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 |
| 4809270 | Variable time slot communication system A time division communication system having peripheral devices controlled om a port circuit is arranged such that the port circuit may have assigned to it a variable number of time slots for any peripheral device associated therewith. Each port circuit ha... | 02/28/1989 |
| 4785408 | Method and apparatus for generating computer-controlled interactive voice services A user-application program for computerized telephone ordering is generated y a system designer who selects and interconnects pre-defined program modules and subroutines using a graphics terminal. The application program allows TOUCH-TONE input data and vo... | 11/15/1988 |
| 4782521 | Communication terminal call reminder with automatic dialing A time manager for a personal terminal can be generally characterized as a things-to-do file in which the user inputs a to-do reminder message along with a data and time that the terminal user wants to be alerted (reminded). The notion of a terminal time ... | 11/01/1988 |
| 4782516 | Fraud prevention in a public telephone station Control equipment employed in a customer-owned public telephone station prevents a user from making unauthorized telephone calls in the telephone system. Operating under the control of a computer in the station, the control equipment is responsive to mome... | 11/01/1988 |
| 4710760 | Photoelastic touch-sensitive screen A touch-sensitive device comprising a photoelastic screen having light reflecting edges and a unique light emitting/receiving module placed at two of the four corners of the screen advantageously determines the location at which a force is applied to the ... | 12/01/1987 |
