US2823666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for illuminating and inspecting cavities
Assignee: National Research Development Corp UK
•
Filing: 1953-04-13
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Granted: 1958-02-18
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Hallpike Charles Skinner
- 👤 Blackmore Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:59
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/06; A61B1/0661; A61B1/0669; G; G02; G02B; G02B23/00; G02B23/24; G02B23/2407; G02B23/2461
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US627011A
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US799114A
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US868373A
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US1213974A
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US2023945A
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US2501438A
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US2697431A
Cited
US2612157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |