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| Number | Title | Issue Date |
| 5461401 | Frequency optimized ink jet printer Ink jet printers used for printing large characters employ a separate solenoid valve for each drop stream which forms part of a printhead matrix. By optimizing the frequency response of the nozzle/valve sub system (primarily the connecting tubing), higher... | 10/24/1995 |
| 4837584 | Security time clock system System for requiring the contemporaneous application of time clock data and personal data to a time card to prevent or signal the fraudulent application of either type of data at a time which is substantially different from the other type of data, i.e., b... | 06/06/1989 |
| 4422079 | Time recorder registration apparatus An apparatus for registering cards for printing in time recorders and the like uses a punch and die to form perforations which are co-linear with the printed information on the card. The perforations are sensed on subsequent insertions of the card and are... | 12/20/1983 |
| 4227199 | Method and device for time-recording A double check or safety system for recording information of two types on a record sheet, such as a time clock card. One type of information is applied automatically to a first predetermined area of the record sheet when the sheet is inserted into a machi... | 10/07/1980 |
