Patent US2703279A successfully refreshed from Google Patents.
Patent US3145096A successfully refreshed from Google Patents.
US4834574A
Expired / Lapsed
US
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Utility cover extension
Assignee: Individual
•
Filing: 1987-07-23
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Granted: 1989-05-30
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Expires: 2007-07-23
Abstract
Abstract A utility cover extension and its process of installation are shown. The extension is adapted to rest on the cover support flange of and make a snug fit in a utility housing for a manhole cover. The extension provides an access opening above the housing. It has a rim and seat that furnish lateral retention and a new, substantially higher elevation for the cover. The extension has at least one spreadable joint for expanding its periphery against the constraint of the housing, and there is a gap in the seat at the joint when the extension is expanded. A discrete closure comprising compressible polymer is applied at the gap for preventing the substantial infiltration of surface water therethrough.
Inventors
- 👤 Harold M. Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:11
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/124; E02D29/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A utility cover extension for paving work, said extension being expandable to fit into a utility housing that itself forms a first access opening and possesses a support flange and a retainer which are disposed to support and laterally retain a manhole cover over said first access opening, the utility cover extension being adapted to rest on the support flange of the housing and provide a higher access opening at a new raised elevation that is suitable for pavement resurfacing, the extension having a rim for lateral retention of a manhole cover, a seat with a bearing surface for a manhole cover at the new raised elevation, and at least one spreadable joint that can be expanded to leave a gap in the seat with concomitant forcing of the outside of the extension against the retainer of the housing, the extension being further characterized by having a descrete closure for said gap comprising a compressible polymer, said closure being effective for preventing the substantial infiltration of surface water through the gap.
Claim 2
Dependent Claim
171 words
A utility cover extension for paving work, said extension being expandable to fit into a utility housing that itself forms a first access opening and possesses a support flange and a retainer which are disposed to support and laterally retain a manhole cover over said first access opening, the utility cover extension being adapted to rest on the support flange of the housing and provide a higher access opening at a new raised elevation that is suitable for pavement resurfacing, the extension having a rim for lateral retention of a manhole cover, a seat with a bearing surface for a manhole cover at the new raised elevation, and at least one spreadable joint that can be expanded to leave a gap in the seat with concomitant forcing of the outside of the extension against the retainer of the housing, the extension being further characterized by having a descrete closure for said gap comprising a compressible polymer, said closure being effective for preventing the substantial infiltration of surface water through the gap.
Claim 3
Dependent Claim
35 words
The utility cover extension of claim 1 wherein at least a portion of the bearing surface of said seat constitutes or sustains a deformable water seal immediately beneath the underside periphery of the manhole cover.
Claim 4
Dependent Claim
135 words
In a process for raising the grade of a manhole cover in a pavement to a new grade that is suitable for resurfacing of the pavement by the installation of a utility cover extension that rests on the support flange of a utility housing and is retained therein by a retainer, makes a snug fit therein and provides a new access opening thereabove, the extension providing lateral retention of and a seat for a manhole cover, the extension having at least one spreadable joint that is expanded to leave a gap in the seat when the outside of the extension is forced against the retainer of the housing, the improvement which comprises: applying at said gap a closure comprising compressible polymer that is effective for sealing the gap against the substantial infiltration of surface water.
Claim 5
Dependent Claim
135 words
In a process for raising the grade of a manhole cover in a pavement to a new grade that is suitable for resurfacing of the pavement by the installation of a utility cover extension that rests on the support flange of a utility housing and is retained therein by a retainer, makes a snug fit therein and provides a new access opening thereabove, the extension providing lateral retention of and a seat for a manhole cover, the extension having at least one spreadable joint that is expanded to leave a gap in the seat when the outside of the extension is forced against the retainer of the housing, the improvement which comprises: applying at said gap a closure comprising compressible polymer that is effective for sealing the gap against the substantial infiltration of surface water.
Claim 6
Dependent Claim
33 words
The process of claim 3 wherein at least a portion of the bearing surface of said seat constitutes or sustains a deformable water seal immediately beneath the underside periphery of the manhole cover.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |