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US1732244A
Expired / Lapsed
US
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Method of hardening steel
Assignee: Individual
•
Filing: 1928-03-29
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Granted: 1929-10-22
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Expires: 1948-03-29
Abstract
No abstract record available.
Inventors
- 👤 Samuel I Salzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:46
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; Y; Y10; Y10S; Y10S76/00; Y10S76/08; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49798
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-10-21 | 1933-04-22 | 1933-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-10-21 | 1937-04-22 | 1937-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-10-21 | 1941-04-22 | 1941-10-22 | $7700.00 | Window Closed / Lapsed |