Underwood Corp
UnderwoodActive Patents
0
Total Holdings
21
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2980225A | Apparatus to produce printed and control records and to uti… | Expired / Lapsed | 1958-04-01 | 1961-04-18 | 0 | Details |
| US2917726A | Magnetic recording system | Expired / Lapsed | 1955-03-25 | 1959-12-15 | 0 | Details |
| US2913176A | Data processing system | Expired / Lapsed | 1955-03-30 | 1959-11-17 | 0 | Details |
| US2910668A | Information processing system | Expired / Lapsed | 1954-03-03 | 1959-10-27 | 0 | Details |
| US2905931A | Comparator | Expired / Lapsed | 1955-02-03 | 1959-09-22 | 0 | Details |
| US2905930A | Data transfer system | Expired / Lapsed | 1954-05-24 | 1959-09-22 | 0 | Details |
| US2902092A | Punch coding records from a typewriter keyboard | Expired / Lapsed | 1955-12-29 | 1959-09-01 | 0 | Details |
| US2902675A | Storage apparatus for typing control | Expired / Lapsed | 1953-07-28 | 1959-09-01 | 0 | Details |
| US2892933A | Frequency divider | Expired / Lapsed | 1953-12-16 | 1959-06-30 | 0 | Details |
| US2889534A | Binary serial comparator | Expired / Lapsed | 1954-06-11 | 1959-06-02 | 0 | Details |
| US2885655A | Binary relative magnitude comparator | Expired / Lapsed | 1954-04-09 | 1959-05-05 | 0 | Details |
| US2861385A | Typewriter support in carrying case | Expired / Lapsed | 1955-09-14 | 1958-11-25 | 0 | Details |
| US2856130A | Printing input and output device for a computer | Expired / Lapsed | 1954-06-29 | 1958-10-14 | 0 | Details |
| US2835807A | Timing device | Expired / Lapsed | 1955-09-20 | 1958-05-20 | 0 | Details |
| US2827566A | Frequency changer | Expired / Lapsed | 1954-12-30 | 1958-03-18 | 0 | Details |
| US2817829A | Magnetic recording system | Expired / Lapsed | 1953-07-23 | 1957-12-24 | 0 | Details |
| US2801406A | Alphabetic-numeric data processor | Expired / Lapsed | 1955-03-30 | 1957-07-30 | 0 | Details |
| US2789218A | Width control apparatus | Expired / Lapsed | 1952-11-13 | 1957-04-16 | 0 | Details |
| US2778634A | Two way suction tape feeding means | Expired / Lapsed | 1952-04-26 | 1957-01-22 | 0 | Details |
| US2764463A | Magnetic recording system | Expired / Lapsed | 1953-05-26 | 1956-09-25 | 0 | Details |
| US2758205A | Limiter for pulse amplifiers | Expired / Lapsed | 1952-01-10 | 1956-08-07 | 0 | Details |