US2978797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular finned metal sections and manufacture thereof
Assignee: Svenska Metallverken AB
•
Filing: 1955-02-21
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Granted: 1961-04-11
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Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 Ekelund Anders Einar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:17
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; F28F1/422; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE502657A
Cited
US1772780A
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US2247243A
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US2281207A
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US2289984A
Cited
US2401542A
Cited
US2463997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |