US3846525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing foam sandwich panels
Assignee: Permatank Eng & Manufacturing Co Inc
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Filing: 1971-08-25
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Granted: 1974-11-05
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Expires: 1991-08-25
Abstract
Abstract In order to provide rapid production of foam sandwich panels of the type utilized in building structures, an upright open top press, which clasps semi-rigid outer panels in spaced relationship, is filled with a quick rising foam by injecting the foam in repetitive horizontal layers using a specially configured gun. The press consists of three essential sections: the two outer members which contain the panel being prepared in the proper configuration without bulges, and a central, removable member which functions to define the bottom and ends of the foam injected between the semi-rigid panels. One of the outer members is mounted on rails to permit ready set up and withdrawal of the press and completed panels. The two outer members of the press are held together during the panel-forming operation by a plurality of snap-over clamps spaced about the periphery.
Inventors
- 👤 F Kinne
- 👤 P Carmack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:58
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/06; B29C44/08; B29C44/12; B29C44/1228; B29C44/1233; B29C33/00; B29C33/20; B29C33/34; B32B2250/00; B32B2250/40; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2311/00; B32B2311/24; B32B2375/00; B32B2607/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
A method for fabricating a foam sandwich panel comprising the steps of: a. placing a first sheet of material, which sheet comprises one outer layer of the completed panel, in an upright position against the inner surface of a press outer stationary member; b. placing a second sheet of material, which sheet comprises a second outer layer of the completed panel, in an upright position against the inner surface of a press outer movable member; c. positioning a temporary and releaseable bottom and side closure member against one of said sheets; d. moving said movable press member toward said stationary press member until said first and said second sheets are juxtaposed in contact with said closure member and spaced apart by said closure member; e. securing said movable press member to said stationary press member; f. injecting a stream of foamable polyurethane reaction mixture in a horizontal pass into the open space between the tops of said sheets; and g. repeating said injecting step at timed intervals until the space between said sheets is filled with the foamed polyurethane from said reaction mixture, said timed interval being equal to or greater than the rising time of said reaction mixture.
Claim 2
Independent Claim
199 words
A method for fabricating a foam sandwich panel comprising the steps of: a. placing a first sheet of material, which sheet comprises one outer layer of the completed panel, in an upright position against the inner surface of a press outer stationary member; b. placing a second sheet of material, which sheet comprises a second outer layer of the completed panel, in an upright position against the inner surface of a press outer movable member; c. positioning a temporary and releaseable bottom and side closure member against one of said sheets; d. moving said movable press member toward said stationary press member until said first and said second sheets are juxtaposed in contact with said closure member and spaced apart by said closure member; e. securing said movable press member to said stationary press member; f. injecting a stream of foamable polyurethane reaction mixture in a horizontal pass into the open space between the tops of said sheets; and g. repeating said injecting step at timed intervals until the space between said sheets is filled with the foamed polyurethane from said reaction mixture, said timed interval being equal to or greater than the rising time of said reaction mixture.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |