US3568388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building panel
Assignee: Butler Manufacturing Co
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Filing: 1968-10-15
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Granted: 1971-03-09
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Expires: 1988-10-15
Abstract
Abstract A BUILDING PANEL TO BE INTERLOCKED WITH SIMILARLY CONFIGURED PANELS TO FORM THE EXTERIOR WALL OF A BUILDING, THE PANEL BEING A PAIR OF END SECTIONS, A CENTER SECTION THEREBETWEEN AND FLUTED SECTIONS RESPECTIVELY BETWEEN THE CENTER SECTION AND THE END SECTIONS, EACH OF THE END SECTIONS HAVING MEANS TO MAKE AN INTERLOCKING FIT WITH CORRESPONDING MEANS ON ADJACENT PANEL.
Inventors
- 👤 Charles T Flachbarth
- 👤 Robert L Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:00
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/72; E04C; E04C2/00; E04C2/30; E04C2/32; E04C2/322
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 |