Patent US2542893A successfully refreshed from Google Patents.
US2542893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inspection of ferro-magnetic materials
Assignee: Individual
•
Filing: 1946-10-03
•
Granted: 1951-02-20
•
Expires: 1966-10-03
Abstract
No abstract record available.
Inventors
- 👤 John C Bender
- 👤 Bernard J Kalb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:30
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9093; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1685965A
Cited
US2049232A
Cited
US2124579A
Cited
US2196314A
Cited
US2242220A
Cited
US2246542A
Cited
US2255053A
Cited
US2359894A
Cited
US2308159A
Cited
US2401280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |