Patent US2531731A successfully refreshed from Google Patents.
US2531731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Razor blade stock
Assignee: Carnegie Illinois Steel Corp
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Filing: 1948-03-24
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Granted: 1950-11-28
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Expires: 1968-03-24
Abstract
No abstract record available.
Inventors
- 👤 Edward N Hibbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:19
CPC Classifications
C; C22; C22C; C22C38/00; C21; C21D; C21D9/00; C21D9/18; C23; C23C; C23C8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
AS AN ARTICLE OF MANUFACUTER, RAYON BLADE STOCK CONSISTING OF A STEEL STRIP FROMED OF RECARBURIZED RIMMED STEEL AND HAVING A CARBON CONTENT OF AT LEAST 1.00% THROUGHOUT ITS THICKNESS.
Claim 2
Dependent Claim
30 words
AS AN ARTICLE OF MANUFACUTER, RAYON BLADE STOCK CONSISTING OF A STEEL STRIP FROMED OF RECARBURIZED RIMMED STEEL AND HAVING A CARBON CONTENT OF AT LEAST 1.00% THROUGHOUT ITS THICKNESS.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |