US2672753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail flaw detector mechanism
Assignee: Sperry Products Inc
•
Filing: 1949-09-17
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Granted: 1954-03-23
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Expires: 1969-09-17
Abstract
No abstract record available.
Inventors
- 👤 Harcourt C Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/08; B61K9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1124185A
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US1124002A
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US1130657A
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US1670007A
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US2011416A
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US2160540A
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US2280226A
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US2463328A
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US2514249A
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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) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |