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US2851618A
Expired / Lapsed
US
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Electrostatic devices
Assignee: Individual
•
Filing: 1955-05-24
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Granted: 1958-09-09
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Expires: 1975-05-24
Abstract
No abstract record available.
Inventors
- 👤 Guenther H Krawinkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:19
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0007; H01; H01H; H01H59/00; H02N; H02N11/00; H02N11/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1446748A
Cited
US993062A
Cited
US2195792A
Cited
US2332947A
Cited
US2393201A
Cited
US2786111A
Cited
US2744980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |