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John J. Ludwick — 4 Patents

ATAT&T: 4 patents #4,409 of 18,772Top 25%
American Telephone And Telegraph: 1 patents #132 of 699Top 20%
ALAmerican Telephone And Telegraph Company, At&T Bell Laboratories: 1 patents #330 of 1,086Top 35%
Hampton, NH: #31 of 123 inventorsTop 30%
New Hampshire: #3,425 of 12,181 inventorsTop 30%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
John J. Ludwick has been granted 4 US patents while listed as an inventor at AT&T. The first was granted in 1986 and the most recent in April 1989. John J. Ludwick ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list John J. Ludwick in Hampton, NH, US.

Patents per Year

Patents granted per year, 1986 to 1989Bar chart with a peak of 1 patents in 1986.peak 11986: 1 patents19861987: 1 patents19871988: 1 patents19881989: 1 patents1989

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
4821286 Quaternary signal regenerator James F. Graczyk, Edward S. Parsons 1989-04-11
4739196 Wide range linear inpedance controller using junction field effect transistors Edward S. Parsons 1988-04-19
4663583 Automatically variable phase characteristic all-pass circuit Edward S. Parsons 1987-05-05
4606046 Converter/line driver circuit for a line repeater — 1986-08-12

Frequent Collaborators

Edward S. Parsons3 shared
James F. Graczyk1 shared

Nearby-Ranked Inventors

Jagadeesh Kandasamy4
Ross CABOT4
George Ueda4
Franz A. Gruswitz4
Tommy Glimberg4
Vinayakaraddy Gulabal4
Sandra Bittorf4
Aviel FOGEL4
Eric Matthew Walton4