US3557513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling tiles with reinforcing member
Assignee: LES INDUSTRIES MONDIALES ARMSTRONG CANADA LTEE
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Filing: 1969-02-14
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Granted: 1971-01-26
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Expires: 1989-02-14
Abstract
Abstract AN OVERSIZE CEILING TILE MADE FROM BOARD SUCH AS MINERAL BOARD IS PROVIDED WITH A REINFORCING SPINE MADE OF SHEET METAL OR LIKE MATERIAL TO PREVENT SAG, THE SPINE BEING DAPTED TO BE SECURELY ATTACHED TO THE TILE WITH PENE- TRATING FASTENERS OF EACH SIDE OF THE SPINE WHICH CRISS-CROSS WITHIN THE CORE OF THE TILE.
Inventors
- 👤 Christian F Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:58
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/04
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |