US2589495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for hardening rolls
Assignee: Selas Corp of America
•
Filing: 1948-01-10
•
Granted: 1952-03-18
•
Expires: 1968-01-10
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
- 👤 Kniveton James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:55
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1711835A
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US1783764A
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US2015699A
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US2275402A
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US2290031A
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US2354267A
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US2365183A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |