Patent Explorer
Browse, filter, and analyze 52 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2631855A | Magnetic recording and reproducing | Brush Development Co | Expired / Lapsed | 1947-09-27 | 1953-03-17 | 1967-09-27 | 0.0 yrs | 0 | |
| US2629861A | Control circuit for signal recording and reproducing systems | Brush Development Co | Expired / Lapsed | 1947-10-11 | 1953-02-24 | 1967-10-11 | 0.0 yrs | 0 | |
| US2616962A | Electrical light-transmission controlling arrangement | Brush Development Co | Expired / Lapsed | 1947-10-15 | 1952-11-04 | 1967-10-15 | 0.0 yrs | 0 | |
| US2594934A | Erasing head for magnetic record members | Brush Development Co | Expired / Lapsed | 1950-01-20 | 1952-04-29 | 1970-01-20 | 0.0 yrs | 0 | |
| US2594841A | Piezoelectric transducer with pushpull and feedback circuit | Brush Development Co | Expired / Lapsed | 1945-08-11 | 1952-04-29 | 1965-08-11 | 0.0 yrs | 0 | |
| US2592703A | Transducing device having an electromechanically responsive dielectric element | Brush Development Co | Expired / Lapsed | 1947-04-09 | 1952-04-15 | 1967-04-09 | 0.0 yrs | 0 | |
| US2583983A | Frequency modulated magnetic recording and reproducing | Brush Development Co | Expired / Lapsed | 1947-05-23 | 1952-01-29 | 1967-05-23 | 0.0 yrs | 0 | |
| US2565159A | Focused electromechanical device | Brush Development Co | Expired / Lapsed | 1949-04-21 | 1951-08-21 | 1969-04-21 | 0.0 yrs | 0 | |
| US2554332A | Piezoelectric device constructed of pentaborate crystal | Brush Development Co | Expired / Lapsed | 1949-09-03 | 1951-05-22 | 1969-09-03 | 0.0 yrs | 0 | |
| US2554324A | Piezoelectric device of ammonium pentaborate crystal | Brush Development Co | Expired / Lapsed | 1949-09-03 | 1951-05-22 | 1969-09-03 | 0.0 yrs | 0 | |
| US2538892A | System to prevent accidental rerecording on a magnetic record | Brush Development Co | Expired / Lapsed | 1946-12-04 | 1951-01-23 | 1966-12-04 | 0.0 yrs | 0 | |
| US2535486A | Magnetic record transducing apparatus having a backing element for coupling a recordtape to the magnetic head | Brush Development Co | Expired / Lapsed | 1946-08-16 | 1950-12-26 | 1966-08-16 | 0.0 yrs | 0 | |
| US2529658A | Transducer and system | Brush Development Co | Expired / Lapsed | 1944-01-31 | 1950-11-14 | 1964-01-31 | 0.0 yrs | 0 | |
| US2521635A | Image retaining system | Brush Development Co | Expired / Lapsed | 1945-11-08 | 1950-09-05 | 1965-11-08 | 0.0 yrs | 0 | |
| US2521329A | Repolarized transducer system | Brush Development Co | Expired / Lapsed | 1947-08-15 | 1950-09-05 | 1967-08-15 | 0.0 yrs | 0 | |
| US2521623A | Magnetic recording and reproducing | Brush Development Co | Expired / Lapsed | 1945-02-06 | 1950-09-05 | 1965-02-06 | 0.0 yrs | 0 | |
| US2515446A | Electromechanical transducer | Brush Development Co | Expired / Lapsed | 1948-06-12 | 1950-07-18 | 1968-06-12 | 0.0 yrs | 0 | |
| US2497654A | System for magnetically recording a modulated carrier in push-pull | Brush Development Co | Expired / Lapsed | 1945-05-29 | 1950-02-14 | 1965-05-29 | 0.0 yrs | 0 | |
| US2497666A | Electrode for piezoelectric crystals | Brush Development Co | Expired / Lapsed | 1945-05-04 | 1950-02-14 | 1965-05-04 | 0.0 yrs | 0 | |
| US2497680A | Piezoelectric crystal unit | Brush Development Co | Expired / Lapsed | 1944-01-19 | 1950-02-14 | 1964-01-19 | 0.0 yrs | 0 |
Showing 1 to 20 of 52 patents
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