Patent US3401495A successfully refreshed from Google Patents.
US3401495A
Expired / Lapsed
US
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Composite floor-ceiling element
Assignee: National Gypsum Co
•
Filing: 1965-04-05
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Granted: 1968-09-17
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Schneller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:20
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/38; E04C2/386
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR907538A
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US2553227A
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US3070196A
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US3293820A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |