Patent US3221590A successfully refreshed from Google Patents.
US3221590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion shell with converging planar surfaces in planes forming a dihedral
Assignee: The Eastern Co
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Filing: 1963-04-25
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Granted: 1965-12-07
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Expires: 1983-04-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick P Dickow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:27
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A MINE ROOF BOLT EXPANSION SHELL ASSEMBLY COMPRISING A PAIR OF OPPOSED SHELL SEGMENTS, A WEDGE MEMBER DISPOSED THEREBETWEEN AND HAVING A THREADED APERTURE TO RECEIVE A BOLT, EACH OF SAID SEGMENTS BEING SHAPED AS A LONGITUDINALLY TAPERING SEGMENT OF A HOLLOW CYLINDER AND BEING SYMMETRICAL ABOUT AN AXIAL PLANE PASSING THROUGH THE AXIS OF THE ASSEMBLY, AND EACH HAVING PLANAR SIDE EDGE SURFACES EXTENDING SUBSTANTIALLY THE ENTIRE LENGTH OF THE SEGMENTS CONVERGING AT THE UPPER END AND LYING IN THE PLANES OF A DIHEDRAL, THE INTERSECTION LINE OF WHICH IS INCLINED UPWARDLY AND AWAY FROM THE AXIS OF THE ASSEMBLY AT AN ANGLE IN THE ORDER OF SEVEN DEGREES, AND THE PLANES OF SAID SURFACES LYING AT ANGLES TO THE PLANE OF SYMMETRY IN THE ORDER OF SEVENTY DEGREES, SAID WEDGE MEMBER HAVING FOUR PLANAR SURFACES ADAPTED TO MATE WITH SAID EDGE SURFACES OF SAID SEGMENTS, AND BEING SUBSTANTIALLY SYMMETRICAL ABOUT SAID AXIAL PLANE AND A SECOND
Claim 2
Dependent Claim
158 words
A MINE ROOF BOLT EXPANSION SHELL ASSEMBLY COMPRISING A PAIR OF OPPOSED SHELL SEGMENTS, A WEDGE MEMBER DISPOSED THEREBETWEEN AND HAVING A THREADED APERTURE TO RECEIVE A BOLT, EACH OF SAID SEGMENTS BEING SHAPED AS A LONGITUDINALLY TAPERING SEGMENT OF A HOLLOW CYLINDER AND BEING SYMMETRICAL ABOUT AN AXIAL PLANE PASSING THROUGH THE AXIS OF THE ASSEMBLY, AND EACH HAVING PLANAR SIDE EDGE SURFACES EXTENDING SUBSTANTIALLY THE ENTIRE LENGTH OF THE SEGMENTS CONVERGING AT THE UPPER END AND LYING IN THE PLANES OF A DIHEDRAL, THE INTERSECTION LINE OF WHICH IS INCLINED UPWARDLY AND AWAY FROM THE AXIS OF THE ASSEMBLY AT AN ANGLE IN THE ORDER OF SEVEN DEGREES, AND THE PLANES OF SAID SURFACES LYING AT ANGLES TO THE PLANE OF SYMMETRY IN THE ORDER OF SEVENTY DEGREES, SAID WEDGE MEMBER HAVING FOUR PLANAR SURFACES ADAPTED TO MATE WITH SAID EDGE SURFACES OF SAID SEGMENTS, AND BEING SUBSTANTIALLY SYMMETRICAL ABOUT SAID AXIAL PLANE AND A SECOND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |