US2501538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic measuring instrument
Assignee: Ruska Instrument Corp
•
Filing: 1945-04-09
•
Granted: 1950-03-21
•
Expires: 1965-04-09
Abstract
No abstract record available.
Inventors
- 👤 Ruska Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:39
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/087; G01R; G01R33/00; G01R33/02; G01R33/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE572094C
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US1432570A
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US1441635A
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US1903969A
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US1858384A
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US2010245A
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GB355418A
Cited
US2060963A
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US2423285A
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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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |