US3614848A
Expired / Lapsed
US
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Foam structural element
Assignee: Pullman Inc
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Filing: 1969-05-08
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Granted: 1971-10-26
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Expires: 1989-05-08
Abstract
Abstract AN INSULATED PANEL HAVING A PREFABRICATED SANDWICH CONSTRUCTION WHICH IS PROVIDED WITH A PAIR OF PARALLEL SHEETS SEPARATED FROM ONE ANOTHER BY A PLURALITY OF SPACED APART SPACERS HAVING FOAMABLE MATERIAL BETWEEN THE SPACERS AND THE SHEETS WHEREIN EACH OF THE SPACERS IS DEFINED BY A PAIR OF PARALLEL STRIPS DEFINING A SECOND SPACE FILLED WITH SUCH FOAMABLE MATERIAL HAVING THE COLUMNAR GROWTH OR RISE AXIS OF THE FOAMABLE MATERIAL BEING IN A DIRECTION PERPENDICULAR TO THE LENGTH OF THE STRIPS AND PARALLEL TO THE PLANE OF SAID STRIPS.
Inventors
- 👤 Robert A Hitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:05
CPC Classifications
B; B32; B32B; B32B1/00; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; B29C44/186; B32B38/00; B32B38/0004; B32B5/00; B32B5/18; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; F; F16; F16L; F16L59/00; F16L59/02; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2419/00; B32B2419/04; Y; Y10; Y10T; Y10T428/00; Y10T428/19; Y10T428/192; Y10T428/23; Y10T428/233; Y10T428/24; Y10T428/24174; Y10T428/24182; Y10T428/249921; Y10T428/249953; Y10T428/249975
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |