Patent US2771568A successfully refreshed from Google Patents.
US2771568A
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Utilizing electron energy for physically and chemically changing members
Assignee: Carl Zeiss AG
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Filing: 1951-11-28
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Granted: 1956-11-20
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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 09:35
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C23C14/30; 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; H01J37/3053; H01J37/31; Y; Y10; Y10S; Y10S164/00; Y10S164/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1326794A
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US2272353A
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US2391780A
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US2428868A
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US2436265A
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US2506660A
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US2600151A
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US2549926A
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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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |