US4416842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directed cracking in concrete panel manufacture
Assignee: Fabcon Inc
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Filing: 1981-03-02
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Granted: 1983-11-22
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Expires: 2001-03-02
Abstract
Abstract A method of manufacture in which the formation of unsightly stress cracks in sandwich-like panels of prestressed concrete are prevented by the formation of a "contraction joint" at selected locations in the panel's outer layer of concrete during its manufacture.
Inventors
- 👤 Richard C. Nash
- 👤 Terrance W. Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:38
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/003; B28B11/00; B28B11/08; B28B11/0863; B28B11/14; B28B11/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
In the method of manufacturing concrete panels wherein a length of substantially flat sandwich structure of concrete and insulation is formed, the structure having an upper concrete layer and a lower concrete support body layer, the insulation being carried intermediate the two, the concrete structure is cured, and then cut to form a plurality of individual panel lengths, the improvement comprising the step of forming indentations while the layer of concrete is still fluid and uncured, the indentations following the path of intended cuts, and subsequently after curing, cutting through the concrete structure along the indentations to form the individual panels, whereby undirected cracking in the upper surface is substantially eliminated.
Claim 2
Dependent Claim
111 words
In the method of manufacturing concrete panels wherein a length of substantially flat sandwich structure of concrete and insulation is formed, the structure having an upper concrete layer and a lower concrete support body layer, the insulation being carried intermediate the two, the concrete structure is cured, and then cut to form a plurality of individual panel lengths, the improvement comprising the step of forming indentations while the layer of concrete is still fluid and uncured, the indentations following the path of intended cuts, and subsequently after curing, cutting through the concrete structure along the indentations to form the individual panels, whereby undirected cracking in the upper surface is substantially eliminated.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the indentations are formed in the upper concrete surface by depressing a tool therein to form a plurality of spaced indentations.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the indentation is in the form of a groove.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the indentation extends only partially through the upper concrete.
Claim 6
Dependent Claim
14 words
The method of claim 1 whereiin the indentation extends substantially through the upper concrete.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the indentations are transverse to the length of the structure.
Claim 8
Independent Claim
82 words
The method of forming a plurality of concrete panels of the sandwich type wherein a concrete sandwich structure of great length is formed, the length having a series of spaced proposed transverse cutting locations whereby a plurality of panels are formed from the continuous structure, wherein transversely extending indentations are formed at each of the proposed cutting locations on the upper surface of the structure in the concrete while the concrete is in the fluid state and prior to curing the concrete.
Claim 9
Independent Claim
82 words
The method of forming a plurality of concrete panels of the sandwich type wherein a concrete sandwich structure of great length is formed, the length having a series of spaced proposed transverse cutting locations whereby a plurality of panels are formed from the continuous structure, wherein transversely extending indentations are formed at each of the proposed cutting locations on the upper surface of the structure in the concrete while the concrete is in the fluid state and prior to curing the concrete.
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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |