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Patent US3564794A successfully refreshed from Google Patents.
US3564794A
Expired / Lapsed
US
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Light diffusing ceiling frame
Assignee: WILSON RESEARCH CORP
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Filing: 1968-10-09
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Granted: 1971-02-23
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Expires: 1988-10-09
Abstract
Abstract A FRAME SUCH AS USED FOR LIGHT DIFFUSING PANELS IS MADE FROM RIGID SECTIONS JOINTED END TO END BY MITER JOINTS WHICH ARE CLAMPED IN ASSEMBLED RELATION BY AN EXTERNAL TENSION BAND, PREFERABLY OF STEEL STRIPPING.
Inventors
- 👤 Elmer Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/32; E06; E06B; E06B3/00; E06B3/96; E06B3/964; E06B3/9649
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |