US2866545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally cooled mandrel
Assignee: Calumet and Hecla Inc
•
Filing: 1956-05-07
•
Granted: 1958-12-30
•
Expires: 1976-05-07
Abstract
No abstract record available.
Inventors
- 👤 Harold E Honkala
- 👤 James L Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:39
CPC Classifications
B; B21; B21C; B21C29/00; B21C29/04; Y; Y10; Y10S; Y10S29/00; Y10S29/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |