US2817612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and quenching bath for hardening steel articles
Assignee: Individual
•
Filing: 1953-09-23
•
Granted: 1957-12-24
•
Expires: 1973-09-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:01
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/56; C21D1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A QUENCHING BATH FOR HARDENING STEEL ARTICLES, COMPRISING THE FOLLOWING IN SUBSTANTIALLY THE PROPORTIONS NAMED:
Claim 2
Dependent Claim
15 words
A QUENCHING BATH FOR HARDENING STEEL ARTICLES, COMPRISING THE FOLLOWING IN SUBSTANTIALLY THE PROPORTIONS NAMED:
References Cited (Backward Citations)
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Cited
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US2271375A
Cited
US2707159A
Cited
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Cited
US2468006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |