US1533236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of locally heat-treating hardened-steel articles
Assignee: Bethlehem Steel Corp
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Filing: 1921-12-09
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Granted: 1925-04-14
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Expires: 1941-12-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/40; H; H05; H05B; H05B3/00; H05B3/0004; Y; Y10; Y10T; Y10T83/00; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9428
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) | 1928-04-13 | 1928-10-13 | 1929-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-13 | 1932-10-13 | 1933-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-13 | 1936-10-13 | 1937-04-14 | $7700.00 | Window Closed / Lapsed |