Patent US3218774A successfully refreshed from Google Patents.
US3218774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow reinforced concrete building panel
Assignee: MCNIEL CONSTRUCTION CO
•
Filing: 1961-09-28
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Granted: 1965-11-23
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Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Mcniel Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:07
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/044; E04C2002/045
Claims Analysis
Total Claims: 0
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |