US3135600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy steels
Assignee: Thos Firth & John Brown Ltd
•
Filing: 1962-03-13
•
Granted: 1964-06-02
•
Expires: 1982-03-13
Abstract
No abstract record available.
Inventors
- 👤 Hardwick Donald
- 👤 Kirkby Henry William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:53
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A HIGH HARDENABILITY ALLOY STEEL HAVING THE FOLLOWING CRITICALLY BALANCED COMPOSITION:
Claim 2
Dependent Claim
11 words
A HIGH HARDENABILITY ALLOY STEEL HAVING THE FOLLOWING CRITICALLY BALANCED COMPOSITION:
References Cited (Backward Citations)
US2327490A
Cited
US2451469A
Cited
US2532117A
Cited
US2797162A
Cited
US2798805A
Cited
US2992148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |