US2948831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overvoltage protective gaps
Assignee: McGraw Edison Co
•
Filing: 1956-08-01
•
Granted: 1960-08-09
•
Expires: 1976-08-01
Abstract
No abstract record available.
Inventors
- 👤 Herman O Stoelting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:34
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1477305A
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US855440A
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US1477304A
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US1612354A
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US2335240A
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CH215001A
Cited
GB612219A
Cited
US2508954A
Cited
US2623197A
Cited
CH302293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |