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Patent US2925893A successfully refreshed from Google Patents.
US2925893A
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US
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Method of producing a hollow beam
Assignee: Individual
•
Filing: 1955-09-07
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Granted: 1960-02-23
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Expires: 1975-09-07
Abstract
No abstract record available.
Inventors
- 👤 Baas Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:00
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/04; E04C3/06; E04C2003/0404; E04C2003/0408; E04C2003/0421; E04C2003/0426; E04C2003/043; E04C2003/0443; E04C2003/0447
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US634692A
Cited
US910192A
Cited
US1081077A
Cited
US2227436A
Cited
US2391766A
Cited
US2468602A
Cited
US2614712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |