Underwood Corp
UnderwoodActive Patents
0
Total Holdings
45
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2999578A | Ribbon change package | Expired / Lapsed | 1959-09-30 | 1961-09-12 | 0 | Details |
| 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 |
| US2913635A | Storage and control device | Expired / Lapsed | 1955-12-23 | 1959-11-17 | 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 |
| US2905299A | Data recording device or devices and programming means ther… | Expired / Lapsed | 1957-05-24 | 1959-09-22 | 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 |
| US2898457A | Amplifier circuit | Expired / Lapsed | 1954-11-30 | 1959-08-04 | 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 |
| US2856525A | Pulse shaper | Expired / Lapsed | 1954-07-09 | 1958-10-14 | 0 | Details |
| US2856130A | Printing input and output device for a computer | Expired / Lapsed | 1954-06-29 | 1958-10-14 | 0 | Details |
| US2854653A | Error detection system | Expired / Lapsed | 1955-10-21 | 1958-09-30 | 0 | Details |
| US2853772A | Component transfer tool | Expired / Lapsed | 1954-10-05 | 1958-09-30 | 0 | Details |
| US2848532A | Data processor | Expired / Lapsed | 1954-06-01 | 1958-08-19 | 0 | Details |
| US2848685A | Voltage indicator | Expired / Lapsed | 1953-12-28 | 1958-08-19 | 0 | Details |
| US2835807A | Timing device | Expired / Lapsed | 1955-09-20 | 1958-05-20 | 0 | Details |
| US2835867A | Signal attenuator | Expired / Lapsed | 1953-11-25 | 1958-05-20 | 0 | Details |
| US2832064A | Cyclic memory system | Expired / Lapsed | 1955-09-06 | 1958-04-22 | 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 |
| US2801407A | Timing channel recording | Expired / Lapsed | 1955-03-30 | 1957-07-30 | 0 | Details |
| US2801344A | Magnetic gating circuit | Expired / Lapsed | 1954-11-29 | 1957-07-30 | 0 | Details |
| US2789218A | Width control apparatus | Expired / Lapsed | 1952-11-13 | 1957-04-16 | 0 | Details |
| US2789224A | Controlled pulse generator | Expired / Lapsed | 1952-10-25 | 1957-04-16 | 0 | Details |
| US2778977A | Component mounting assemblage | Expired / Lapsed | 1952-05-22 | 1957-01-22 | 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 |
| US2756409A | Pulse monitoring system | Expired / Lapsed | 1952-07-23 | 1956-07-24 | 0 | Details |
| US2746295A | Apparatus for measuring and recording pressures indicated b… | Expired / Lapsed | 1951-12-12 | 1956-05-22 | 2 | Details |
| US2737883A | High speed high quality printer | Expired / Lapsed | 1954-06-29 | 1956-03-13 | 0 | Details |
| US2647600A | Overload release device | Expired / Lapsed | 1951-10-13 | 1953-08-04 | 0 | Details |
| US2634224A | Brightening and passivating solution | Expired / Lapsed | 1949-12-22 | 1953-04-07 | 2 | Details |
| US2600200A | Repeat type action for typewriters and like machines | Expired / Lapsed | 1949-10-19 | 1952-06-10 | 0 | Details |
| US2533155A | Machine supporting assembly for business machines | Expired / Lapsed | 1944-11-16 | 1950-12-05 | 0 | Details |
| US2425967A | Ribbon feed for typewriting machines | Expired / Lapsed | 1945-05-26 | 1947-08-19 | 0 | Details |
| US2374374A | Multiplying machine | Expired / Lapsed | 1939-12-30 | 1945-04-24 | 0 | Details |