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US4038798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite permanent block-form for reinforced concrete construction and method of making same
Assignee: U-Forms International Inc
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Filing: 1975-03-05
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Granted: 1977-08-02
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Expires: 1995-03-05
Abstract
Abstract A lightweight, thermally insulated block form for reinforced concrete construction, having voids extending between the top and bottom for the reception of concrete, is formed with a sheath of a non-combustible porous material, and a core of foamed plastic. The concrete receiving voids in the core are lined with circular cardboard tubes. In the finished construction the organically based plastic foam is enclosed in the inorganic non-combustible sheath and the surface of the sheath is sufficiently non-resilient so that when properly coated to seal and protect the surface it may act as a finished building surface. The cardboard tubes contain the concrete slurry so as to isolate the low tensile strength, low modulus of elasticity block against forces which might crack or distort the block. The block is formed by joining four rectangular slabs of the sheath material at their ends to form an open-ended rectangular tube. This tube and the cardboard tubes are placed as inserts in a mold and the mold is filled with self-foaming plastic which forms a core between the exterior walls of the circular cardboard tubes and the interior walls of the surrounding sheath, adhering to those surfaces, integrating the whole.
Inventors
- 👤 Melvin H. Sachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:47
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; B; B28; B28B; B28B19/00; B28B19/0038; E04B; E04B2/00; E04B2/02; E04B2/14; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04B2002/0202; E04B2002/0204; E04B2002/0208; E04B2002/023
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
75 words
A block having voids adapted to act as forms for molding reinforced concrete for use in forming a reinforced concrete structure which said blocks provide the walls, comprising: a closed rectangular sheath having walls formed of a porous, non-combustible inorganic material; a central core formed of a foamed plastic adhered to the entire interior surfaces of said sheath; and central voids extending through said foamed plastic section generally parallel to the walls of said sheath.
Claim 2
Dependent Claim
75 words
A block having voids adapted to act as forms for molding reinforced concrete for use in forming a reinforced concrete structure which said blocks provide the walls, comprising: a closed rectangular sheath having walls formed of a porous, non-combustible inorganic material; a central core formed of a foamed plastic adhered to the entire interior surfaces of said sheath; and central voids extending through said foamed plastic section generally parallel to the walls of said sheath.
Claim 3
Dependent Claim
39 words
The block of claim 1 wherein the central voids are lined with thin walled tubes having their outer surfaces adhered to the foamed plastic, the tubes having a higher tensile strength and higher modulus of elasticity than the plastic.
Claim 4
Dependent Claim
17 words
The blocks of claim 1 wherein the outer porous sheath is primarily formed of an inorganic material.
Claim 5
Dependent Claim
21 words
The form of claim 1 wherein the plastic foam permeates and adheres to the interior surfaces of the porous rectangular sheath.
Claim 6
Dependent Claim
80 words
A block for use in reinforced concrete construction having a top, bottom and four sides, voids extending through the blocks from the top to the bottom, adapted to align with voids in similar blocks when the blocks stacked on top of one another to form cavities for the reception of concrete slurry, the block having a central core of foamed plastic with said voids formed therein, and having a continuous sheath formed on four sides of a porous, inorganic material.
Claim 7
Dependent Claim
80 words
A block for use in reinforced concrete construction having a top, bottom and four sides, voids extending through the blocks from the top to the bottom, adapted to align with voids in similar blocks when the blocks stacked on top of one another to form cavities for the reception of concrete slurry, the block having a central core of foamed plastic with said voids formed therein, and having a continuous sheath formed on four sides of a porous, inorganic material.
Claim 8
Dependent Claim
30 words
The block of claim 5 wherein the sheath of porous inorganic material comprises four boards of such material, abutting one another at their ends to form a rectangular, open-ended box.
Claim 9
Dependent Claim
15 words
The block of claim 6 wherein the outer sheath is formed of glass based material.
Claim 10
Dependent Claim
17 words
The block of claim 11 wherein the glass based material comprises glass grit in a porous structure.
Claim 11
Dependent Claim
11 words
The block of claim 12 wherein the foamed plastic constitutes polyurethane.
Claim 12
Dependent Claim
26 words
The block of claim 13 wherein the walls of the voids are formed of circular tubes of cardboard having their outer surfaces adhered to the polyurethane.
Claim 13
Dependent Claim
41 words
The block of claim 5 wherein the voids in the foamed plastic are lined with thin walled tubes having a higher tensile strength and higher modulus of elasticity than the plastic and having their outer surfaces adhered to the foamed plastic.
Claim 14
Dependent Claim
13 words
The block of claim 7 wherein the tubes are circular in cross section.
Claim 15
Dependent Claim
12 words
The block of claim 8 wherein the tubes are formed of cardboard.
Claim 16
Dependent Claim
15 words
The block of claim 8 wherein the tubes compromise a densified skin of said plastic.
Claim 17
Independent Claim
106 words
The method of making construction blocks having central voids formed therein for the reception of concrete comprising: forming a rectangular sheath consisting of four rectangular slabs of a porous non-combustible material having their edges joined to one another so as to form an open, four-sided box; supporting thin walled hollow tubes within the spaced enclosed by the sheath so that the axes of the tubes extend parallel to the walls of the sheath; and forming a volume of self-expanding foamed plastic between the interior of the sheath and the exterior surface of the tubes so that the plastic adheres to both the sheath and the tubes.
Claim 18
Independent Claim
106 words
The method of making construction blocks having central voids formed therein for the reception of concrete comprising: forming a rectangular sheath consisting of four rectangular slabs of a porous non-combustible material having their edges joined to one another so as to form an open, four-sided box; supporting thin walled hollow tubes within the spaced enclosed by the sheath so that the axes of the tubes extend parallel to the walls of the sheath; and forming a volume of self-expanding foamed plastic between the interior of the sheath and the exterior surface of the tubes so that the plastic adheres to both the sheath and the tubes.
Claim 19
Dependent Claim
27 words
The method of forming blocks of claim 15 further comprising inserting both the sheath and the tubes in a mold in which the foamed plastic is expanded.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |