| 4912761 |
Security facsimile systems |
| Mar-27-1990 |
A security method and apparatus for use in providing an "invisible envelope" for facsimile transmission thereby avoiding the casual reading of documents by persons interposed between the receiver of the... |
| 4896355 |
Patterning device for security facsimile systems |
| Jan-23-1990 |
A device for photocopying a document to produce two partial documents for secure transmission. A transparent sheet is placed on the cover glass and has a pattern thereon of portions which are complementary... |
| 4600921 |
Full-field teletext system with dynamic addressability |
| Jul-15-1986 |
The present invention permits a teletext system operator to adjust subscriber access to service levels individually by adjusting a code at the head end station. A head-end station transmits a tier description... |
| 4463417 |
Modular, processor-controlled document distribution terminal |
| Jul-31-1984 |
A document distribution terminal is organized with two supervisory processing units, one to control the data entry and data printing and the other to control the terminal. Each of these processing units... |
| 4459611 |
Image conversion system |
| Jul-10-1984 |
The image converting system including an image input step or apparatus for converting an original document information into electric image signals an inputting them, an image processing step or apparatus... |
| 4454575 |
Shared memory system with access by specialized peripherals managed by controller initialized by supervisory CPU |
| Jun-12-1984 |
A document distribution terminal can be required to process large volumes of data. To do this rapidly and efficiently, the terminal herein is organized to process all of the data in specialized peripheral... |
| 4392021 |
Secure facsimile transmission system using time-delay modulation |
| Jul-5-1983 |
Method and apparatus for secure transmission of analog signals, particularly facsimile signals. The analog signal is first converted to a frequency-modulated signal, if not already one, and is then converted... |
| 4140873 |
Multi-mode digital enciphering system |
| Feb-20-1979 |
The specification discloses an electronic digital enciphering system which is selectively operable in a plurality of different modes. The system may be operated in an off-line mode for preparing enciphered... |
