US2868637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve material
Assignee: Rich Manuf Corp
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Filing: 1957-06-10
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Granted: 1959-01-13
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Expires: 1977-06-10
Abstract
No abstract record available.
Inventors
- 👤 Leland W Kirkpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:50
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
AN ALLOY STEEL HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION: PERCENT CARBON 0.90-1.20 SILICON 0.60-1.00 MANGANESE 5.00-7.00 CHROMIUM 20.00-22.00 MOLYBDENUM 0.40-0.60 ALUMINUM 0.75-1.25 NITROGEN 0.20-0.40 THE REMAINDER BEING SUBSTANTIALLY IRON.
Claim 2
Dependent Claim
28 words
AN ALLOY STEEL HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION: PERCENT CARBON 0.90-1.20 SILICON 0.60-1.00 MANGANESE 5.00-7.00 CHROMIUM 20.00-22.00 MOLYBDENUM 0.40-0.60 ALUMINUM 0.75-1.25 NITROGEN 0.20-0.40 THE REMAINDER BEING SUBSTANTIALLY IRON.
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |