US3372551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof support
Assignee: Individual
•
Filing: 1966-08-30
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Granted: 1968-03-12
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Expires: 1986-08-30
Abstract
No abstract record available.
Inventors
- 👤 Hans-Joachim Von Hippel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:21
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/08; E21D23/081; E21D15/00; E21D15/50; E21D15/54; E21D15/55; E21D23/006; E21D23/0069; E21D23/04; E21D23/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
APPARATUS FOR SUPPORTING ROOFS IN MINING GALLERIES AND OTHER UNDERGROUND EXCAVATIONS, COMPRISING AT LEAST ONE PROP HAVING UPPER AND LOWER END PORTIONS; AND UPPER AND LOWER ADVANCING UNITS EACH INCLUDING FIRST AND SECOND CAPS MOUNTED ON THE RESPECTIVE END PORTIONS OF THE PROP AND EACH MOVABLE SUBSTANTIALLY VERTICALLY INTO ENGAGEMENT WITH THE ADJOINING MATERIAL SURROUNDING THE EXCAVATION, SAID FIRST AND SECOND CAPS BEING RECIPROCABLE WITH REFERENCE TO EACH OTHER IN A SUBSTANTIALLY HORIZONTAL DIRECTION AND SAID PROP BEING COUPLED FOR SUCH HORIZONTAL MOVEMENT WITH ONE OF SAID CAPS, FRICTION REDUCING MEANS INTERPOSED BETWEEN SAID FIRST AND SECOND CAPS, OPERATING MEANS FOR MOVING SAID CAPS VERTICALLY WITH REFERENCE TO EACH OTHER, AND SHIFTING MEANS FOR MOVING SAID FIRST CAP HORIZONTALLY WHEN THE SECOND CAP IS IN ENGAGEMENT WITH SAID MATERIAL, AND VICE VERSA.
Claim 2
Dependent Claim
132 words
APPARATUS FOR SUPPORTING ROOFS IN MINING GALLERIES AND OTHER UNDERGROUND EXCAVATIONS, COMPRISING AT LEAST ONE PROP HAVING UPPER AND LOWER END PORTIONS; AND UPPER AND LOWER ADVANCING UNITS EACH INCLUDING FIRST AND SECOND CAPS MOUNTED ON THE RESPECTIVE END PORTIONS OF THE PROP AND EACH MOVABLE SUBSTANTIALLY VERTICALLY INTO ENGAGEMENT WITH THE ADJOINING MATERIAL SURROUNDING THE EXCAVATION, SAID FIRST AND SECOND CAPS BEING RECIPROCABLE WITH REFERENCE TO EACH OTHER IN A SUBSTANTIALLY HORIZONTAL DIRECTION AND SAID PROP BEING COUPLED FOR SUCH HORIZONTAL MOVEMENT WITH ONE OF SAID CAPS, FRICTION REDUCING MEANS INTERPOSED BETWEEN SAID FIRST AND SECOND CAPS, OPERATING MEANS FOR MOVING SAID CAPS VERTICALLY WITH REFERENCE TO EACH OTHER, AND SHIFTING MEANS FOR MOVING SAID FIRST CAP HORIZONTALLY WHEN THE SECOND CAP IS IN ENGAGEMENT WITH SAID MATERIAL, AND VICE VERSA.
References Cited (Backward Citations)
FR1407929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |