US3568390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced floor panel structure
Assignee: Donn Inc
•
Filing: 1969-02-24
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Granted: 1971-03-09
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Expires: 1989-02-24
Abstract
Abstract A FLOOR PANEL TO BE USED IN AN ELEVATED FLOOR ASSEMBLY, INCLUDING A FLAT TOP SHEET MEMBER RECEPTIVE TO A TREAD SURFACE, A BOTTOM SHEET WITH RAISED RIBS AND AN INTERMEDIATE SHEET WITH CORRUGATIONS. THE INTERMEDIATE AND BOTTOM SHEET HAVE OPPOSING FLANGES THAT OVERLIE ONE ANOTHER TO FORM PANEL SIDES. THE RIBS OF THE BOTTOM SHEET FORM CHANNELED BEAMS ALONG THE EDGES OF THE PANEL. THE CORRUGATIONS OF THE INTERMEDIATE SHEET ARE LOCATED WITHIN THE CHANNELED BEAMS, THE TOP SHEET MEMBER AND UNDER SHEETS ARE SECURED TO ONE ANOTHER SO THAT THE PANEL RESISTS DEFORMATION AND DEFLECTIONS UNDER LOAD.
Inventors
- 👤 Eugene L Swensen
- 👤 Raymond Gerald Sartori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:24
CPC Classifications
E; E04; E04F; E04F15/00; E04F15/02; E04F15/024; E04F15/02405; E04F15/02435; E04F15/02417
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |