US2711468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric heating tunnels
Assignee: National Cylinder Gas Co
•
Filing: 1951-12-28
•
Granted: 1955-06-21
•
Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Carl E Ellsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:48
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2504109A
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US2506814A
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US2521808A
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US2546004A
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US2532460A
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US2632090A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |