Inventor · disambiguated record
Douglas Johnston
Also filed as: JOHNSTON DOUGLAS · JOHNSTON DOUGLAS E JR · JOHNSTON DOUGLAS W
9 granted patents·2 pending applications·406 citations·filing 1974–2016
90Inventor score
Files withBLUE CO JOHN6CANADIAN PATENTS DEV1GLASROCK PRODUCTS1JOHN BLUE COMPANY A DIVISION O1MOTIVE MECHATRONICS INC1
Top patents by PatentIndex Score
11 records- 0191US4141676APump for soil fumigantBLUE CO JOHN·Filed 1977·Granted Feb 27, 1979·98 cites·6 claims
- 0281US4624193AMethod and apparatus for the jet injection of agricultural liquids into the soilBLUE CO JOHN·Filed 1985·Granted Nov 25, 1986·48 cites·18 claims
- 0377US4094303ATympanic membrane ventGLASROCK PRODUCTS·Filed 1977·Granted Jun 13, 1978·87 cites·10 claims
- 0469US4306545ARe-entrant cannula deviceCANADIAN PATENTS DEV·Filed 1980·Granted Dec 22, 1981·114 cites·3 claims
- 0560US4100610ARotating nozzle sparging system for suspension fertilizer tanksBLUE CO JOHN·Filed 1975·Granted Jul 11, 1978·23 cites·6 claims
- 0655US4519542ABoomless, sprayer for field application for agricultural liquidsJOHN BLUE COMPANY A DIVISION O·Filed 1984·Granted May 28, 1985·19 cites·27 claims
- 0750US2006229900A1System and method for managing real estate investmentsPAUL MARC J·Filed 2005·Application pending·0 cites
- 0843US3961572ATramper for cotton module makerBLUE CO JOHN·Filed 1974·Granted Jun 8, 1976·9 cites·17 claims
- 0938US2017095695A1Actively Controlled Exercise DeviceMOTIVE MECHATRONICS INC·Filed 2016·Application pending·0 cites
- 1031US4267971AMethod and means of presetting the output rate of a centrifugal pump agricultural metering systemBLUE CO JOHN·Filed 1979·Granted May 19, 1981·6 cites·16 claims
- 1127US5312045ALiquid metering distributor for agricultural chemicalsBLUE CO JOHN·Filed 1993·Granted May 17, 1994·2 cites·10 claims
Join the waitlist — get patent alerts
Get an alert when Douglas Johnston files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →