US3864888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for employing gypsum board as forms for poured concrete ceiling and floor structures
Assignee: Kaiser Gypsum Co Inc
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Filing: 1973-05-22
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Granted: 1975-02-11
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Expires: 1993-05-22
Abstract
Abstract A form element for use in constructing concrete ceiling and floor structures. The form element includes two gypsum board strips and a gypsum board sheet assembled in a U-shaped configuration. The gypsum board pieces are retained in such configuration by two or more spacers within the U shape; steel strapping circumscribing the structure at the locations of the spacers retain the parts in assembled condition. The form element is inverted and placed on two adjacent joists with the gypsum board sheet spanning the space between the joists. The spacers support the sheet so that it can support fluid concrete placed thereon. After the concrete cures, the spacers are removed by cutting the strapping. A method for forming the ceiling and floor structure is also disclosed.
Inventors
- 👤 Burr E Tupper
- 👤 Luis Cejudo Alva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/17; E04B5/23; E04B5/26; E04B5/261
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
178 words
A method for forming a floor structure comprising the steps of providing at least two parallelly spaced beams having vertical abutments that define upward facing marginal shoulders thereon, providing first and second unitary gypsum board strips having a thickness corresponding to the width of the marginal shoulders, placing the strips on the respective shoulders with the strips in substantially vertical disposed relation, providing a unitary gypsum board sheet having a width corresponding to the space between confronting vertical abutments of adjacent beams, placing the sheet on the upper edges of the strips so as to define, with said strips, an inverted channel-shaped configuration hAving a downwardly open concavity, supporting the medial region of the sheet with a transversely extending member contacting said sheet and the first and second strips, placing fluid concrete on top of the sheet, permitting the concrete to cure, terminating the supporting step by removing the transversely extending member and leaving said gypsum strips and sheet in place so as to create an integral structure comprised of concrete and said gypsum board strips and sheet.
Claim 2
Independent Claim
178 words
A method for forming a floor structure comprising the steps of providing at least two parallelly spaced beams having vertical abutments that define upward facing marginal shoulders thereon, providing first and second unitary gypsum board strips having a thickness corresponding to the width of the marginal shoulders, placing the strips on the respective shoulders with the strips in substantially vertical disposed relation, providing a unitary gypsum board sheet having a width corresponding to the space between confronting vertical abutments of adjacent beams, placing the sheet on the upper edges of the strips so as to define, with said strips, an inverted channel-shaped configuration hAving a downwardly open concavity, supporting the medial region of the sheet with a transversely extending member contacting said sheet and the first and second strips, placing fluid concrete on top of the sheet, permitting the concrete to cure, terminating the supporting step by removing the transversely extending member and leaving said gypsum strips and sheet in place so as to create an integral structure comprised of concrete and said gypsum board strips and sheet.
Claim 3
Dependent Claim
53 words
A method according to Claim 1 wherein said supporting step comprises the steps of providing a rigid rectangular member having a length equal to the distance between the gypsum board strips when supported on the beam shoulders and mounting the rigid member between said strips in underlying relation to the gypsum board sheet.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |