Patent US2633420A successfully refreshed from Google Patents.
US2633420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy irons and steels
Assignee: Individual
•
Filing: 1949-10-21
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Granted: 1953-03-31
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Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Spitz Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C38/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A FERROUS ALLOY COMPOSED OF MORE THAN 6.0% BUT NOT MORE THAN 20% EACH OF CHROMIUM, NICKEL, COPPER AND MOLYBDENUM, THE SUM TOTAL OF SAID ELEMENTS BEING LESS THAN 50%, AND THE REMAINDER BEING SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
37 words
A FERROUS ALLOY COMPOSED OF MORE THAN 6.0% BUT NOT MORE THAN 20% EACH OF CHROMIUM, NICKEL, COPPER AND MOLYBDENUM, THE SUM TOTAL OF SAID ELEMENTS BEING LESS THAN 50%, AND THE REMAINDER BEING SUBSTANTIALLY ALL 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) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |