Patent FR1256632A successfully refreshed from Google Patents.
US2793281A
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US
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Drilling by electrons
Assignee: Carl Zeiss AG
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Filing: 1951-11-28
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Granted: 1957-05-21
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Expires: 1971-11-28
Abstract
No abstract record available.
Inventors
- 👤 Steigerwald Karl Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:12
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/31; G; G04; G04D; G04D3/00; G04D3/0069; G04D3/0071; H01J37/02; H01J37/04; H01J37/06; H01J37/063; H01J37/16; H01J37/3002; H01J37/3007; H01J37/301; H01J37/305; H01J37/3053; Y; Y10; Y10S; Y10S164/00; Y10S164/04; Y10S29/00; Y10S29/026; Y10T; Y10T29/00; Y10T29/49; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1864591A
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US2060610A
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US2128581A
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US2267752A
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US2267714A
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US2345080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |