US2467302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making edged tool blades
Assignee: Heli Coil Corp
•
Filing: 1947-06-21
•
Granted: 1949-04-12
•
Expires: 1967-06-21
Abstract
No abstract record available.
Inventors
- 👤 John O Forster
- 👤 Eugene M Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:14
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1542892A
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GB395919A
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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) | 1952-04-11 | 1952-10-11 | 1953-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-11 | 1956-10-11 | 1957-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-11 | 1960-10-11 | 1961-04-12 | $7700.00 | Window Closed / Lapsed |