US4262701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete pipe lift hole plug
Assignee: Individual
•
Filing: 1979-08-13
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Granted: 1981-04-21
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Expires: 1999-08-13
Abstract
Abstract A plug for obturating the lift hole of poured concrete drain pipes or conduits. The plug, preferably made of a plastic molding, comprises a generally thin head in the form of a plate and a shank projecting from the lower surface of the plate. The shank has at least two substantially thin fins extending radially from a common centerline, each having a lateral edge engageable with the rim of the hole obturated by the plug. Preferably, the shank is cruciform and is provided with three or more fins.
Inventors
- 👤 Roger R. Beacom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:18
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/1683; Y; Y10; Y10S; Y10S220/00; Y10S220/13; Y10S220/19; Y10T; Y10T152/00; Y10T152/10; Y10T152/10882; Y10T152/10909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A plug comprising a head having a top surface and a bottom surface and a shank projecting from said bottom surface of said head, said head being substantially a thin plate and said shank having a centerline substantially orthogonal to said head bottom surface and extending from the center of said head bottom surface, said shank being formed of at least a pair of substantially thin plate flat fin-like members projecting substantially orthogonal to said head bottom surface, said fin-like members being interconnected along said centerline and each having an outer edge tapering from said head bottom surface to the end of said shank and each being disposed in a plane extending radially from said common centerline.
Claim 2
Dependent Claim
117 words
A plug comprising a head having a top surface and a bottom surface and a shank projecting from said bottom surface of said head, said head being substantially a thin plate and said shank having a centerline substantially orthogonal to said head bottom surface and extending from the center of said head bottom surface, said shank being formed of at least a pair of substantially thin plate flat fin-like members projecting substantially orthogonal to said head bottom surface, said fin-like members being interconnected along said centerline and each having an outer edge tapering from said head bottom surface to the end of said shank and each being disposed in a plane extending radially from said common centerline.
Claim 3
Dependent Claim
26 words
The plug of claim 1 wherein said head bottom surface is curved to conform to a curved surface provided with an aperture obturated by said plug.
Claim 4
Dependent Claim
29 words
The plug of claim 1 wherein said shank is cruciform and is formed of at least three of said fin-like members disposed regularly substantially at equal mutual angular orientation.
Claim 5
Dependent Claim
26 words
The plug of claim 3 wherein said head bottom surface is curved to conform to a curved surface provided with an aperture obturated by said plug.
Claim 6
Dependent Claim
15 words
The plug of claim 1 wherein said head and said shank are made of plastic.
Claim 7
Dependent Claim
14 words
The plug of claim 5 wherein said head and said shank are molded integrally.
Claim 8
Dependent Claim
17 words
The plug of claim 5 wherein said head and said shank are made separately and attached together.
Claim 9
Dependent Claim
34 words
The plug of claim 4 wherein said head is substantially oval, said curved bottom surface extends transversely and said shank is formed of four fin-like members disposed substantially at right angle to each other.
Claim 10
Dependent Claim
20 words
The plug of claim 1 wherein each of said fin-like members has a lateral step formed at said outer edge.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |