Patent US3471981A successfully refreshed from Google Patents.
US3471981A
Expired / Lapsed
US
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Suspended ceiling construction with interconnected baffles and wireways
Assignee: LUMINOUS CEILINGS Inc
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Filing: 1966-06-20
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Granted: 1969-10-14
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Expires: 1986-06-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Segil
- 👤 Richard N White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:46
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/06; E04B9/064; E04B9/12; E04B9/14; E04B9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1742947A
Cited
GB308268A
Cited
FR47434E
Cited
US2698071A
Cited
DE848244C
Cited
DE925793C
Cited
US2884512A
Cited
US3203150A
Cited
US3210534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |