Alphanumeric entry system having an electronic lock feature
US4670747A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Nov 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/673
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An alphanumeric entry system which is provided with an electronic lock-out feature. The keypad entry system of the present invention comprises an alphanumeric keypad having function keys and display, a microprocessor, and an electronically programmable read-only memory device. The display consists of a series of system related menus as well as an alphanumeric display area. One of the system related menus corresponds to a locking feature, which may be activated by a general purpose function key. In the locking mode, the radio keypad toggles between a locked and unlocked condition as controlled by the function keys in accordance with a predefined sequence. The alphanumeric entry system of the present invention is particularly advantageous for use with portable two-way communications equipment which operate in a plurality of radio systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.