Patent US2458771A successfully refreshed from Google Patents.
US2458771A
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US
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Supersonic reflectoscope
Assignee: University of Michigan (System)
•
Filing: 1943-03-15
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Granted: 1949-01-11
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Expires: 1963-03-15
Abstract
No abstract record available.
Inventors
- 👤 Floyd A Firestone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:07
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/06; G01N29/0609
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2050059A
Cited
US2052183A
Cited
US2280572A
Cited
US2132655A
Cited
US2178074A
Cited
US2232044A
Cited
US2236532A
Cited
US2121359A
Cited
US2237651A
Cited
US2234830A
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US2208378A
Cited
US2292045A
Cited
US2275460A
Cited
US2304813A
Cited
US2314920A
Cited
US2405238A
Cited
US2256085A
Cited
US2368449A
Cited
US2312761A
Cited
US2284064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |