US2574564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for partial surface hardening of crankshafts, camshafts, or like workpieces
Assignee: ABB Norden Holding AB
•
Filing: 1948-11-12
•
Granted: 1951-11-13
•
Expires: 1968-11-12
Abstract
No abstract record available.
Inventors
- 👤 Hogel Lennart
- 👤 Thelemarck Thor
- 👤 Lindberg Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:16
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1708512A
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US2264301A
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US2202759A
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US2368809A
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US2255103A
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US2326206A
Cited
US2312597A
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US2349813A
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US2398085A
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US2511059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |