Patent US2697461A successfully refreshed from Google Patents.
US2697461A
Expired / Lapsed
US
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Method of making spirals for hollow panel structures
Assignee: Individual
•
Filing: 1949-02-23
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Granted: 1954-12-21
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Konstandt Francisco Goldberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:09
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; B; B27; B27D; B27D1/00; B27D1/04; B27D1/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR835092A
Cited
US2261264A
Cited
GB538306A
Cited
US2385352A
Cited
US2538330A
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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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |