Patent US2793147A successfully refreshed from Google Patents.
US2793147A
Expired / Lapsed
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Salt bath for heat treating carbon alloyed steel
Assignee: Albert Erdmann & Co
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Filing: 1954-10-07
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Granted: 1957-05-21
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Expires: 1974-10-07
Abstract
No abstract record available.
Inventors
- 👤 Erdmann Albert
- 👤 Boelke Elli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:03
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
25 words
IN THE HEAT TREATMENT OF ALLOYED CARBON STEELS, THE STEPS WHICH COMPRISE PREHEATING SUCH STEELS IN A PREHEATING BOTH A TEMPERATURE BETWEEN 600-1100*C. CONSISTING OF
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) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |