Patent US4641993A successfully refreshed from Google Patents.
US4641993A
Expired / Lapsed
US
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Highway barrier with level internal ducts and construction method
Assignee: Oldcastle Precast Inc
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Filing: 1985-10-15
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Granted: 1987-02-10
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Expires: 2005-10-15
Abstract
Abstract A roadway barrier section includes a duct formed of two intersecting frusto-conical portions placed end-to-end so that the central portion thereof. The duct is formed using two tapering mold plugs that are preferably frusto-conical. The mold plugs are placed in a concrete form so that the lower edge of the duct is a straight line that is generally parallel to the base of the barrier section.
Inventors
- 👤 Walter B. Hahne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:20
CPC Classifications
E; E03; E03F; E03F3/00; E03F3/04; B; B28; B28B; B28B21/00; B28B21/86; E01; E01C; E01C11/00; E01C11/22; E01C11/221; E01C11/223; E01F; E01F15/00; E01F15/02; E01F15/08; E01F15/081; E01F15/083; E01F15/088
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A method for forming a roadway barrier section having a duct therein comprising the steps of: placing a first frusto-conically shaped mold plug in a concrete form; placing a second frusto-conically shaped mold plug in the concrete form; positioning the first and second mold plugs end to end with the smaller end of each plug abutting each other; aligning one frusto-conical side of the first plug with one frusto-conical side of the second plug to form a continuous mold for the duct, said aligned sides defining a substantially straight line the entire length of the duct, for forming a duct which has one side, which when the barrier is in use is disposed as the bottom of the duct, defining a substantially straight line, the top side of the duct defining a center portion which is smaller than the end portions of the duct; pouring concrete into said form; allowing the concrete to cure; and removing the first and second mold plugs from the concrete.
Claim 2
Independent Claim
165 words
A method for forming a roadway barrier section having a duct therein comprising the steps of: placing a first frusto-conically shaped mold plug in a concrete form; placing a second frusto-conically shaped mold plug in the concrete form; positioning the first and second mold plugs end to end with the smaller end of each plug abutting each other; aligning one frusto-conical side of the first plug with one frusto-conical side of the second plug to form a continuous mold for the duct, said aligned sides defining a substantially straight line the entire length of the duct, for forming a duct which has one side, which when the barrier is in use is disposed as the bottom of the duct, defining a substantially straight line, the top side of the duct defining a center portion which is smaller than the end portions of the duct; pouring concrete into said form; allowing the concrete to cure; and removing the first and second mold plugs from the concrete.
Claim 3
Dependent Claim
55 words
The method of claim 1 further including the steps of: forming a projection in a first end of the barrier section; and forming a recess in the other end of the barrier section to correspond to the projection so that a plurality of such barrier sections may be joined end-to-end to form a continuous barrier.
Claim 4
Dependent Claim
33 words
The method of claim 1 further including the step of forming drainage scuppers in sides of the barrier section to permit fluid communication between the sides of the barrier section and the duct.
References Cited (Backward Citations)
US1598059A
Cited
US4105353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |