US4003208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly for preventing the fall of dust and debris in a mine
Assignee: Individual
•
Filing: 1975-09-02
•
Granted: 1977-01-18
•
Expires: 1995-09-02
Abstract
Abstract An assembly for preventing the falling of dust and debris from the roof and from the break of a mine, particularly a coal mine. The assembly comprises a shield support structure having roof bars and a roof covering disposed between the roof of the mine and the roof bars. The roof covering includes a welded wire-netting sheet having longitudinal and transverse wires with a dust-tight web welded or fixed in between said longitudinal and transverse wires.
Inventors
- 👤 Gerd Hornung
- 👤 Franz Disse
- 👤 Peter Rossler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:28
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0004; E21D23/0034; E21D23/03; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12347
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
An assembly for preventing the falling of dust and debris from the roof and from the break of a mine, said assembly comprising: a. a shield support structure having roof bars, b. a roof covering disposed between the roof of the mine and the roof bars, c. said roof covering including a welded wire-netting sheet having longitudinal and transverse wires with a dust-tight web welded in between and at points of intersection of said longitudinal and transverse wires, and d. said longitudinal wires being disposed on one side of the web and said transverse wires being disposed on the other side of the web.
Claim 2
Dependent Claim
104 words
An assembly for preventing the falling of dust and debris from the roof and from the break of a mine, said assembly comprising: a. a shield support structure having roof bars, b. a roof covering disposed between the roof of the mine and the roof bars, c. said roof covering including a welded wire-netting sheet having longitudinal and transverse wires with a dust-tight web welded in between and at points of intersection of said longitudinal and transverse wires, and d. said longitudinal wires being disposed on one side of the web and said transverse wires being disposed on the other side of the web.
Claim 3
Dependent Claim
23 words
An assembly as defined in claim 1 wherein the dust-tight web is composed of plurality of strips disposed within the wire netting sheet.
Claim 4
Dependent Claim
18 words
An assembly as defined in claim 1 wherein the dust-tight web extends from edge-to-edge of the wire-netting sheet.
Claim 5
Dependent Claim
24 words
An assembly as defined in claim 1 wherein the web is composed of a plastic composition that is inherently elastic and not easily flammable.
Claim 6
Dependent Claim
32 words
An assembly as defined in claim 1 wherein the web extends from edge-to-edge of the wire-netting sheet and is composed of a plastic composition that is inherently elastic and not easily flammable.
Claim 7
Dependent Claim
14 words
An assembly as defined in claim 1 wherein said web is composed of polyethylene.
Claim 8
Dependent Claim
108 words
In an assembly for preventing the falling of dust and debris from the roof of a mine, a roof covering disposed on a shield or step support, said roof covering comprising: a. a wire-netting sheet having longitudinal and transverse wires of at least 1mm with a mesh width of about 30 to 50mm, b. a web of plastic material that is inherently elastic and not easily flammable and being fixed at the intersection points of and between the longitudinal and transverse wires, and c. said longitudinal wires being disposed on one side of the web and said transverse wires being disposed on the other side of the web.
Claim 9
Dependent Claim
108 words
In an assembly for preventing the falling of dust and debris from the roof of a mine, a roof covering disposed on a shield or step support, said roof covering comprising: a. a wire-netting sheet having longitudinal and transverse wires of at least 1mm with a mesh width of about 30 to 50mm, b. a web of plastic material that is inherently elastic and not easily flammable and being fixed at the intersection points of and between the longitudinal and transverse wires, and c. said longitudinal wires being disposed on one side of the web and said transverse wires being disposed on the other side of the web.
Claim 10
Dependent Claim
17 words
A roof covering as defined in claim 7 wherein the thickness of the wires is 1.6 mm.
Claim 11
Dependent Claim
15 words
A roof covering as defined in claim 7 wherein said web is composed of polyethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |