US3885423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring changes in the area surrounding a mining cavity
Assignee: Bergwerksverband GmbH
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Filing: 1974-02-20
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Granted: 1975-05-27
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Expires: 1994-02-20
Abstract
Abstract A method of measuring changes in the area surrounding a mining cavity in which a rod-like anchor is rigidly embedded in a bore hole of such cavity. The changes in the strata are measured in several planes distributed over the length of the anchor by sensors, which are mounted on the outside of the anchor at axially spaced intervals and dimension and speed of changes in the strata are detected on the outside of the bore hole from connections to the sensors.
Inventors
- 👤 Fritz Schuermann
- 👤 Herbert Muller
- 👤 Horst Boddicker
- 👤 Peter-Paul Heusinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
G; G01; G01V; G01V9/00; E; E02; E02D; E02D1/00; E02D1/08; G01B; G01B7/00; G01B7/16; G01B7/18; G01B2210/00; G01B2210/66
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
Method of measuring changes in the area surrounding a mining cavity consisting in adhesively embedding an elongate rod-like anchor rigidly in a bore hole of such cavity, measuring changes in the strata surrounding the anchor in several planes distributed over the length thereof by a series of operatively connected sensors arranged fixedly and at a predetermined distance to each other, And detecting outside of the bore hole and from the sensors the dimension and speed of changes in the strata.
Claim 2
Dependent Claim
80 words
Method of measuring changes in the area surrounding a mining cavity consisting in adhesively embedding an elongate rod-like anchor rigidly in a bore hole of such cavity, measuring changes in the strata surrounding the anchor in several planes distributed over the length thereof by a series of operatively connected sensors arranged fixedly and at a predetermined distance to each other, And detecting outside of the bore hole and from the sensors the dimension and speed of changes in the strata.
Claim 3
Dependent Claim
22 words
Method as claimed in claim 1, in which measuring takes place at each spaced interval at diametrically opposed positions on the anchor.
Claim 4
Dependent Claim
24 words
Method as claimed in claim 1, in which measuring takes place at each interval at positions spaced 90* from each other about the anchor.
References Cited (Backward Citations)
US3327396A
Cited
US3482443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |