Patent US3305656A successfully refreshed from Google Patents.
Patent US4029128A successfully refreshed from Google Patents.
US4029128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for plugging a hollow of a concrete pile
Assignee: Individual
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Filing: 1975-07-07
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Granted: 1977-06-14
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Expires: 1995-07-07
Abstract
Abstract A plug for a concrete pile having a hollow extending therethrough is in the form of inflatable bag made of impervious material and is secured in a portion of the follow adjacent the top end of the concrete pile in tight engagement with the inner surface thereof when the bag is in inflated position.
Inventors
- 👤 Shigeharu Yamagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:21
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/10; E; E02; E02D; E02D15/00; E02D15/02; E02D15/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A method for plugging the center of a vertical hollow concrete pile driven into the ground comprising introducing into the hollow pile an air bag made of a flexible material impervious to air, inflating said bag from a source of air under pressure in an amount sufficient to force the bag into tight engagement with the interior side walls of said pile, disconnecting the bag from the source of air and closing the same while under pressure, and introducing concrete onto the top of the pile to subject the inflated bag to the weight of the concrete to compress the confined air therein and thereby urge the bag into tighter frictional engagement with said interior side walls during the plug formation.
Claim 2
Independent Claim
121 words
A method for plugging the center of a vertical hollow concrete pile driven into the ground comprising introducing into the hollow pile an air bag made of a flexible material impervious to air, inflating said bag from a source of air under pressure in an amount sufficient to force the bag into tight engagement with the interior side walls of said pile, disconnecting the bag from the source of air and closing the same while under pressure, and introducing concrete onto the top of the pile to subject the inflated bag to the weight of the concrete to compress the confined air therein and thereby urge the bag into tighter frictional engagement with said interior side walls during the plug formation.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |