US2463222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treating apparatus
Assignee: Electric Furnace Co
•
Filing: 1943-07-20
•
Granted: 1949-03-01
•
Expires: 1963-07-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US705844A
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US815674A
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US1855339A
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US1938306A
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US2137868A
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US2137869A
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US2226986A
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US2250868A
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US2265112A
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US2284141A
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US2249411A
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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) | 1952-02-29 | 1952-08-30 | 1953-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-29 | 1956-08-30 | 1957-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-29 | 1960-08-30 | 1961-03-01 | $7700.00 | Window Closed / Lapsed |