US3369152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for collecting electrostatic charges from poor conductors by means of a corona discharge
Assignee: Individual
•
Filing: 1965-04-19
•
Granted: 1968-02-13
•
Expires: 1985-04-19
Abstract
No abstract record available.
Inventors
- 👤 Spengler Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:28
CPC Classifications
H; H01; H01T; H01T14/00; H05; H05F; H05F3/00; H05F3/04
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |