US2448794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for testing magnetic materials
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1943-06-04
•
Granted: 1948-09-07
•
Expires: 1963-06-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas T Goldsmith
- 👤 Mann Estle Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:36
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01R33/1223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2329811A
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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) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |