Inventor · disambiguated record
Hallis D. Campbell
Also filed as: CAMPBELL HALLIS D
4 granted patents·93 citations·filing 1979–1984
79Inventor score
Technology areasA01F
Files withGEHL CO4
Top patents by PatentIndex Score
4 records- 0192US4257219ACylindrical bale forming machine having hydraulic control means for controlling the bale densityGEHL CO·Filed 1979·Granted Mar 24, 1981·45 cites·13 claims
- 0274US4510741ARotary crop balerGEHL CO·Filed 1984·Granted Apr 16, 1985·23 cites·9 claims
- 0370US4244167ARotary baler for forming cylindrical hay balesGEHL CO·Filed 1979·Granted Jan 13, 1981·18 cites·3 claims
- 0441US4259900ARotary baling machine having dual belt driving means with overrunning sprocketGEHL CO·Filed 1979·Granted Apr 7, 1981·7 cites·4 claims
Join the waitlist — get patent alerts
Get an alert when Hallis D. Campbell 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 →