Patent US2483477A successfully refreshed from Google Patents.
US2483477A
Expired / Lapsed
US
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Surface hardening of ferrous metal articles
Assignee: Linde Air Products Co
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Filing: 1943-11-30
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Granted: 1949-10-04
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Expires: 1963-11-30
Abstract
No abstract record available.
Inventors
- 👤 Shorter Albert Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:59
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2246674A
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US2292209A
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US2415856A
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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) | 1952-10-03 | 1953-04-04 | 1953-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-03 | 1957-04-04 | 1957-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-03 | 1961-04-04 | 1961-10-04 | $7700.00 | Window Closed / Lapsed |