Erwin J. Wittmann has been granted 12 US patents while listed as an inventor at Rca . The first was granted in 1980 and the most recent in April 1988. Erwin J. Wittmann ranks #396,045 of 4,157,543 US inventors in our database (top 9.5%). Patent records list Erwin J. Wittmann in North Plainfield, NJ, US.
Patents per Year Patents granted per year, 1980 to 1988 Bar chart with a peak of 4 patents in 1981. peak 4 1980: 2 patents 1980 1981: 4 patents 1981 1982: 2 patents 1982 1983: 1 patents 1983 1984: 1 patents 1984 1988: 2 patents 1988
Issued Patents All Time
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Showing 1–12 of 12 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
4739503 Carry/borrow propagate adder/subtractor John Armer 1988-04-19
4722066 Digital signal overflow correction apparatus John Armer 1988-01-26
4485353 PLL Oscillator synchronizing system with matrix for phase correction Ta-Fang Fang , Leopold A. Harwood , Jack Craft 1984-11-27
$1,602,000
4385311 Filter and phase shift circuit for a television automatic flesh color correction system Leopold A. Harwood 1983-05-24
$1,757,000
4325076 Electronic filter for generating a third harmonic signal Leopold A. Harwood 1982-04-13
$1,601,000
4318051 Symmetrically gain controlled differential amplifier Leopold A. Harwood 1982-03-02
$819,000
4263610 Controlled output composite keying signal generator for a television receiver Robert L. Shanley, II , Leopold A. Harwood 1981-04-21
$672,000
4256482 Herbicidal composition Alfred Diskus , Engelbert Auer 1981-03-17
4253110 Automatic kinescope beam current limiter with sequential control modes Leopold A. Harwood , Robert L. Shanley, II 1981-02-24
$1,149,000
4249199 Phase compensated controlled oscillator Leopold A. Harwood 1981-02-03
$1,159,000
4229759 Signal detector including sample and hold circuit with reduced offset error Leopold A. Harwood 1980-10-21
$1,319,000
4203131 Predictable automatic brightness control circuit in a video signal image reproducing system Leopold A. Harwood , Robert L. Shanley, II 1980-05-13
$1,296,000