Assignee
CHARCON TUNNELS LTD
4 granted patents·55 citations·filing 1974–1989
Top patents by PatentIndex Score
4 records- 0179US4397583ATunnel liningsCHARCON TUNNELS LTD·Filed 1980·Granted Aug 9, 1983·36 cites·4 claims
- 0254US4452549ATunnel lining ringsCHARCON TUNNELS LTD·Filed 1982·Granted Jun 5, 1984·9 cites·2 claims
- 0338US3969906ATunnelling shieldsCHARCON TUNNELS LTD·Filed 1974·Granted Jul 20, 1976·10 cites·2 claims
- 0419US4969769AJoints between elementsCHARCON TUNNELS LTD·Filed 1989·Granted Nov 13, 1990·0 cites·1 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →