US3472997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron collection system
Assignee: United States Department of the Navy
•
Filing: 1966-08-26
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Granted: 1969-10-14
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Expires: 1986-08-26
Abstract
No abstract record available.
Inventors
- 👤 Auguste B El-Kareh
- 👤 Charles R Marsh
- 👤 Richard B Fair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:11
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/244; H01J37/30; H01J37/3002; H01J37/3005; H01J2237/00; H01J2237/244; H01J2237/2443; H01J2237/2445; H01J2237/2448; H01J2237/2449; H01J2237/245; H01J2237/24507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2769911A
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US3056027A
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US2928943A
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US3223837A
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US3146347A
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US3158733A
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US3196246A
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US3221133A
Cited
US3381132A
Cited
US3351755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |