Individual holder
BLACKMAN CALVIN C
3 granted patents·26 citations·filing 1975–1989
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
3 records- 0159US4038022AIn-furnace recuperatorBLACKMAN CALVIN C·Filed 1975·Granted Jul 26, 1977·19 cites·10 claims
- 0230US4867675AMethod and apparatus for quickly purging atmosphere gas from bell furnaceBLACKMAN CALVIN C·Filed 1988·Granted Sep 19, 1989·6 cites·4 claims
- 0324US4964798AMethod and apparatus for quickly purging atmosphere gas from bell furnaceBLACKMAN CALVIN C·Filed 1989·Granted Oct 23, 1990·1 cites·3 claims
Join the waitlist — get patent alerts
Get an alert when BLACKMAN CALVIN C 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 →