Patent US2455538A successfully refreshed from Google Patents.
US2455538A
Expired / Lapsed
US
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Method of making cutting tools
Assignee: J F Helmold and Bro Inc
•
Filing: 1945-01-08
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Granted: 1948-12-07
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Expires: 1965-01-08
Abstract
No abstract record available.
Inventors
- 👤 Wagner Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:45
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/12
Claims Analysis
Total Claims: 0
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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) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |