US2539237A
Expired / Lapsed
US
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Method of making interleaved tubes
Assignee: METALLSCHLAUCHFABRIK AG
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Filing: 1946-01-24
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Granted: 1951-01-23
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Expires: 1966-01-24
Abstract
No abstract record available.
Inventors
- 👤 Dreyer Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:25
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/04; F16J3/047; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0815; B21C37/09; B21C37/15; B21C37/154; B21D; B21D15/00; B21D15/04; B21D15/06; F16L; F16L51/00; F16L51/02; F16L51/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879
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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |