Patent US2457170A successfully refreshed from Google Patents.
US2457170A
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Optical projection apparatus
Assignee: International Standard Electric Corp
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Filing: 1944-06-08
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Granted: 1948-12-28
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Expires: 1964-06-08
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:34
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/08
Claims Analysis
Total Claims: 0
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US2019234A
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US2155248A
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US2365613A
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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) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |