US2918633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encased electric filter
Assignee: Sprague Electric Co
•
Filing: 1955-02-23
•
Granted: 1959-12-22
•
Expires: 1975-02-23
Abstract
No abstract record available.
Inventors
- 👤 Schenker Bernard
- 👤 Richard W Lord
- 👤 John P Camphell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:05
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/224; H03; H03H; H03H1/00
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |