Individual holder
HULTBERG DONALD E
US·4 granted patents·61 citations·filing 1981–2014
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
4 records- 0181US4368962ASolar tracking apparatus and systemHULTBERG DONALD E·Filed 1981·Granted Jan 18, 1983·55 cites·29 claims
- 0272US8540382B1Spherical mechanical linkage and multi-axis trackersHULTBERG DONALD E·Filed 2012·Granted Sep 24, 2013·6 cites·21 claims
- 0346US8979286B2Spherical mechanical linkage and multi-axis trackersHULTBERG DONALD E·Filed 2014·Granted Mar 17, 2015·0 cites·20 claims
- 0444US8770768B2Spherical mechanical linkage and multi-axis trackersHULTBERG DONALD E·Filed 2013·Granted Jul 8, 2014·0 cites·20 claims
Join the waitlist — get patent alerts
Get an alert when HULTBERG DONALD E files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →