US2842839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making expanding mandrels
Assignee: Erickson Tool Co
•
Filing: 1956-12-13
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Granted: 1958-07-15
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Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Milton L Benjamin
- 👤 Franklyn E Winnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:47
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/40; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17529; Y10T29/00; Y10T29/49; Y10T29/49758
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |