Patent US2815831A successfully refreshed from Google Patents.
US2815831A
Expired / Lapsed
US
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Column and rafter assembly for rigid frame buildings
Assignee: Butler Manufacturing Co
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Filing: 1956-01-09
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Granted: 1957-12-10
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Expires: 1976-01-09
Abstract
No abstract record available.
Inventors
- 👤 Roger A Hield
- 👤 Carmen L Ramirez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:45
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/02; E04B7/022; E04C; E04C3/00; E04C3/38; E04C3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |