Inventor
Gottfried Siebenhofer
Inventor
Vienna, AT
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Dprimary
E21DShafts38%
E21CMining or quarrying31%
F15BSystems acting by means of fluids in general8%
F16KValves8%
Y02PClimate change mitigation technologies in the production or processing of goods8%
Y10TTechnical subjects covered by former us classification8%
PatentTitleYear
6,257,671'Device for protecting selective cutting machines against overload'20015,498,069'Bit holder with a detachably fixed bit bushing'19964,555,143'Apparatus for cutting rock'19854,404,893'Hydraulic mine prop'19834,344,354'Valve arrangement for controlling the stroke of a telescoping prop'19824,299,517'Mine roof supporting structure'19814,197,035'Shield-carrying roof support unit'19804,147,391'Swivel mechanism for kerf-cutting machines'19794,111,227'Pressure relief valve for hydraulic mine supporting elements'1978Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1978–1983Patents assigned to VOEST AG (4)· patent assignee history
1978–1983Based in Vienna, AT· patent location history
1981–1985Patents assigned to VOEST ALPINE AG (3)· patent assignee history
1985–2001Based in Fohnsdorf, AT· patent location history
1996Patents assigned to VOEST ALPINE BERGTECHNIK (1)· patent assignee history
2001Patents assigned to TAMROCK VOEST ALPINE BERGTECH (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| VOEST AG | 4 | 1978–1983 |
| VOEST ALPINE AG | 3 | 1981–1985 |
| TAMROCK VOEST ALPINE BERGTECH | 1 | 2001 |
| VOEST ALPINE BERGTECHNIK | 1 | 1996 |
Locations
| Location | Patents | Span |
|---|---|---|
| Vienna, AT | 6 | 1978–1983 |
| Fohnsdorf, AT | 3 | 1985–2001 |