US2548246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc-over protective system for high-frequency heating systems
Assignee: Girdler Corp
•
Filing: 1946-12-11
•
Granted: 1951-04-10
•
Expires: 1966-12-11
Abstract
No abstract record available.
Inventors
- 👤 John E Walstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:07
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/46; H05B6/48; H05B6/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1671205A
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US1708027A
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US1608048A
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US1975812A
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US1938160A
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US2073701A
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US2129088A
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US2353677A
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US2412553A
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US2455822A
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US2415799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |