US3381132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron detector for selectively detecting secondary electrons and high-energy reflected electrons
Assignee: Hitachi Ltd
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Filing: 1965-02-25
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Granted: 1968-04-30
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Expires: 1985-02-25
Abstract
No abstract record available.
Inventors
- 👤 Okano Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:08
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G21; G21K; G21K1/00; G21K1/10; H; H01; H01J; H01J29/00; H01J29/84; H01J37/00; H01J37/02; H01J37/244; H01J2237/00; H01J2237/244; H01J2237/2443; H01J2237/2445; H01J2237/24455; H01J2237/24475; H01J2237/2448; H01J2237/245; H01J2237/24507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |