Patent US5579124A successfully refreshed from Google Patents.
US2976971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling construction
Assignee: Individual
•
Filing: 1955-05-13
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Granted: 1961-03-28
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Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 George A Lundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:44
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1709047A
Cited
US1878812A
Cited
US1931713A
Cited
US2307653A
Cited
US2309695A
Cited
US2841255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |