Brush Development Co
Brush DeveActive Patents
0
Total Holdings
52
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2631855A | Magnetic recording and reproducing | Expired / Lapsed | 1947-09-27 | 1953-03-17 | 0 | Details |
| US2629861A | Control circuit for signal recording and reproducing systems | Expired / Lapsed | 1947-10-11 | 1953-02-24 | 0 | Details |
| US2616962A | Electrical light-transmission controlling arrangement | Expired / Lapsed | 1947-10-15 | 1952-11-04 | 0 | Details |
| US2594934A | Erasing head for magnetic record members | Expired / Lapsed | 1950-01-20 | 1952-04-29 | 0 | Details |
| US2594841A | Piezoelectric transducer with pushpull and feedback circuit | Expired / Lapsed | 1945-08-11 | 1952-04-29 | 0 | Details |
| US2592703A | Transducing device having an electromechanically responsive… | Expired / Lapsed | 1947-04-09 | 1952-04-15 | 0 | Details |
| US2583983A | Frequency modulated magnetic recording and reproducing | Expired / Lapsed | 1947-05-23 | 1952-01-29 | 0 | Details |
| US2565159A | Focused electromechanical device | Expired / Lapsed | 1949-04-21 | 1951-08-21 | 0 | Details |
| US2554324A | Piezoelectric device of ammonium pentaborate crystal | Expired / Lapsed | 1949-09-03 | 1951-05-22 | 0 | Details |
| US2554332A | Piezoelectric device constructed of pentaborate crystal | Expired / Lapsed | 1949-09-03 | 1951-05-22 | 0 | Details |
| US2538892A | System to prevent accidental rerecording on a magnetic reco… | Expired / Lapsed | 1946-12-04 | 1951-01-23 | 0 | Details |
| US2535486A | Magnetic record transducing apparatus having a backing elem… | Expired / Lapsed | 1946-08-16 | 1950-12-26 | 0 | Details |
| US2529658A | Transducer and system | Expired / Lapsed | 1944-01-31 | 1950-11-14 | 0 | Details |
| US2521329A | Repolarized transducer system | Expired / Lapsed | 1947-08-15 | 1950-09-05 | 0 | Details |
| US2521635A | Image retaining system | Expired / Lapsed | 1945-11-08 | 1950-09-05 | 0 | Details |
| US2521623A | Magnetic recording and reproducing | Expired / Lapsed | 1945-02-06 | 1950-09-05 | 0 | Details |
| US2515446A | Electromechanical transducer | Expired / Lapsed | 1948-06-12 | 1950-07-18 | 0 | Details |
| US2497654A | System for magnetically recording a modulated carrier in pu… | Expired / Lapsed | 1945-05-29 | 1950-02-14 | 0 | Details |
| US2497666A | Electrode for piezoelectric crystals | Expired / Lapsed | 1945-05-04 | 1950-02-14 | 0 | Details |
| US2497680A | Piezoelectric crystal unit | Expired / Lapsed | 1944-01-19 | 1950-02-14 | 0 | Details |
| US2493742A | Magnetic transducing core for magnetic record transducers | Expired / Lapsed | 1946-07-30 | 1950-01-10 | 0 | Details |
| US2487962A | Electromechanical transducer | Expired / Lapsed | 1947-08-29 | 1949-11-15 | 0 | Details |
| US2479987A | Multiplate electrotransducer | Expired / Lapsed | 1947-10-11 | 1949-08-23 | 0 | Details |
| US2479926A | Electrotransducer and method of making same | Expired / Lapsed | 1947-10-11 | 1949-08-23 | 0 | Details |
| US2460726A | Surface roughness measuring device | Expired / Lapsed | 1943-01-11 | 1949-02-01 | 0 | Details |
| US2449484A | Method of controlling the resistivity of p-type crystals | Expired / Lapsed | 1945-11-10 | 1948-09-14 | 0 | Details |
| US2446479A | Method and apparatus for correcting phase shift distortion … | Expired / Lapsed | 1942-09-17 | 1948-08-03 | 0 | Details |
| US2439446A | Control circuit for signal recording and reproducing systems | Expired / Lapsed | 1944-11-29 | 1948-04-13 | 0 | Details |
| US2427062A | Vibrational energy transmitter or receiver | Expired / Lapsed | 1944-06-02 | 1947-09-09 | 0 | Details |
| US2424295A | Rotatable magnetic reproducing means | Expired / Lapsed | 1943-07-21 | 1947-07-22 | 0 | Details |
| US2423922A | Piezoelectric transducer | Expired / Lapsed | 1943-01-11 | 1947-07-15 | 0 | Details |
| US2419195A | Apparatus and method for magnetic recording | Expired / Lapsed | 1944-06-16 | 1947-04-22 | 0 | Details |
| US2416279A | Magnetic signal reproducing means | Expired / Lapsed | 1943-01-22 | 1947-02-25 | 0 | Details |
| US2414489A | Piezoelectric device | Expired / Lapsed | 1942-02-23 | 1947-01-21 | 0 | Details |
| US2397923A | Roughness measuring means | Expired / Lapsed | 1943-02-26 | 1946-04-09 | 0 | Details |
| US2388242A | Piezoelectric transducer | Expired / Lapsed | 1943-01-11 | 1945-11-06 | 0 | Details |
| US2383832A | Intercommunication system | Expired / Lapsed | 1943-01-29 | 1945-08-28 | 0 | Details |
| US2378383A | Transient signal recordingreproducing device | Expired / Lapsed | 1942-10-17 | 1945-06-19 | 0 | Details |
| US2378388A | Recording and reproducing device | Expired / Lapsed | 1942-01-01 | 1945-06-19 | 0 | Details |
| US2373445A | Piezoelectric device | Expired / Lapsed | 1943-01-18 | 1945-04-10 | 0 | Details |
| US2370166A | Timing device | Expired / Lapsed | 1942-12-16 | 1945-02-27 | 0 | Details |
| US2370134A | Timing device | Expired / Lapsed | 1942-08-21 | 1945-02-27 | 0 | Details |
| US2370176A | Means for and method of measuring time intervals | Expired / Lapsed | 1942-06-22 | 1945-02-27 | 0 | Details |
| US2370133A | Means for and method of timing | Expired / Lapsed | 1942-04-02 | 1945-02-27 | 0 | Details |
| US2365738A | Relay | Expired / Lapsed | 1942-04-09 | 1944-12-26 | 0 | Details |
| US2344615A | Means for and method of making joints | Expired / Lapsed | 1942-04-02 | 1944-03-21 | 0 | Details |
| US2324024A | Piezoelectric unit | Expired / Lapsed | 1941-07-07 | 1943-07-13 | 0 | Details |
| US2288600A | Electrical device | Expired / Lapsed | 1940-12-19 | 1942-07-07 | 0 | Details |
| US2282319A | Leakage reducing means | Expired / Lapsed | 1941-02-28 | 1942-05-12 | 0 | Details |
| US2269403A | Piezoelectric unit | Expired / Lapsed | 1940-08-03 | 1942-01-06 | 0 | Details |
| US2207539A | Piezoelectric apparatus | Expired / Lapsed | 1939-07-26 | 1940-07-09 | 0 | Details |
| US2105010A | Piezoelectric device | Expired / Lapsed | 1933-02-25 | 1938-01-11 | 0 | Details |