US2686904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona shielding insulation
Assignee: AT&T Inc
•
Filing: 1950-12-13
•
Granted: 1954-08-17
•
Expires: 1970-12-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert S Feder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:59
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; H01F27/34; H01F27/36; H01F27/363
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1235373A
Cited
GB355291A
Cited
FR930287A
Cited
US2441047A
Cited
US2439859A
Cited
GB617834A
Cited
US2547371A
Cited
US2521513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |