Description
Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 3/00: Raising shafts, i.e. working upwards from the bottom
E21D 3/00
Sub-Class
Stats
- 1 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- 0 Total Patent Owners
- 21 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11441423 | Method and apparatus for the bottom-up construction of vertical risers from underground passes through the soil, using a pipe jacking equipment | May 16, 18 | Sep 13, 22 | WEBUILD S.P.A. |
Recent Publications
Not Available
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 51 Months (last 2 years Issuances)
- 51 Months (last 5 years Issuances)