Patent US3320751A successfully refreshed from Google Patents.
US3320751A
Expired / Lapsed
US
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Support
Assignee: Individual
•
Filing: 1963-01-29
•
Granted: 1967-05-23
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Expires: 1983-01-29
Abstract
No abstract record available.
Inventors
- 👤 Groetschel Karl Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:49
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/04; E21D23/06; E21D17/00; E21D17/02; E21D17/0206; E21D23/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
AN ADVANCING MINE SUPPORTING ARRANGEMENT FOR BRACING THE ROOF OF A MINE, COMPRISING, IN COMBINATION: (A) A REAR ASSEMBLY HAVING AT LEAST TWO STRUTS; (B) A FORWARD ASSEMBLY ASSOCIATED THEREWITH AND HAVING ONLY ONE PROP AND A CAP THEREON DEFINING A LEVER HAVING A LONGER AND A SHORTER LEVER ARM, SAID CAP EXTENDING REARWARDLY PAST THE FORWARD-MOST PORTION OF THE REAR ASSEMBLY; AND (C) LOAD TRANSFER MEANS POSITIONED ON AND EXTENDING UPWARDLY FROM AT LEAST ONE END PORTION OF SAID CAP AND SUPPORTED ON AT LEAST SAID SHORTER LEVER ARM OF THE CAP FOR TRANSFERRING TO THE END PORTION OF THE CAP AT LEAST THE MAJOR PORTION OF THE SUPPORTING EFFECT OF THE PROP, FOR CORRESPONDINGLY DECREASING THE SUPPORTING EFFECT OF THE CAP UPON THE ROOF IN THE VICINITY WHERE THE PROP SUPPORTS THE CAM AND FOR ENGAGING THE LONGER LEVER ARM AGAINST THE ROOF.
Claim 2
Dependent Claim
145 words
AN ADVANCING MINE SUPPORTING ARRANGEMENT FOR BRACING THE ROOF OF A MINE, COMPRISING, IN COMBINATION: (A) A REAR ASSEMBLY HAVING AT LEAST TWO STRUTS; (B) A FORWARD ASSEMBLY ASSOCIATED THEREWITH AND HAVING ONLY ONE PROP AND A CAP THEREON DEFINING A LEVER HAVING A LONGER AND A SHORTER LEVER ARM, SAID CAP EXTENDING REARWARDLY PAST THE FORWARD-MOST PORTION OF THE REAR ASSEMBLY; AND (C) LOAD TRANSFER MEANS POSITIONED ON AND EXTENDING UPWARDLY FROM AT LEAST ONE END PORTION OF SAID CAP AND SUPPORTED ON AT LEAST SAID SHORTER LEVER ARM OF THE CAP FOR TRANSFERRING TO THE END PORTION OF THE CAP AT LEAST THE MAJOR PORTION OF THE SUPPORTING EFFECT OF THE PROP, FOR CORRESPONDINGLY DECREASING THE SUPPORTING EFFECT OF THE CAP UPON THE ROOF IN THE VICINITY WHERE THE PROP SUPPORTS THE CAM AND FOR ENGAGING THE LONGER LEVER ARM AGAINST THE ROOF.
References Cited (Backward Citations)
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GB704338A
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GB854967A
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GB858633A
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GB830704A
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GB865922A
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GB885645A
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GB845302A
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BE569133A
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FR1201150A
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US3097829A
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FR1251175A
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US3169377A
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FR1272244A
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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) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |