Patent US1762768A successfully refreshed from Google Patents.
Patent US2939206A successfully refreshed from Google Patents.
US2939206A
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Method of manufacturing open-web metal joists
Assignee: Individual
•
Filing: 1955-03-01
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Granted: 1960-06-07
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Expires: 1975-03-01
Abstract
No abstract record available.
Inventors
- 👤 Keller Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:07
CPC Classifications
B; B21; B21F; B21F27/00; B21F27/12; B21F27/20; B21D; B21D47/00; B21D47/04; E; E04; E04C; E04C5/00; E04C5/01; E04C5/06; E04C5/065; Y; Y10; Y10S; Y10S29/00; Y10S29/029; Y10T; Y10T29/00; Y10T29/49; Y10T29/49616; Y10T29/49623; Y10T29/49625; Y10T29/49789; Y10T29/49798
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2325200A
Cited
US2256812A
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US2308080A
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US2339884A
Cited
US2485282A
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US2662272A
Cited
US2624430A
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US2746139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |