Patent US563264A successfully refreshed from Google Patents.
Patent US3218436A successfully refreshed from Google Patents.
US3218436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical aircraft heater
Assignee: Motors Liquidation Co
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Filing: 1963-03-12
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Granted: 1965-11-16
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Expires: 1983-03-12
Abstract
No abstract record available.
Inventors
- 👤 Jack T Edwards
- 👤 Charles K Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:36
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/12; H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; H05B2203/00; H05B2203/002; H05B2203/007; H05B2203/011; H05B2203/017; H05B2214/00; H05B2214/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
ELECTRICALLY HEATED DE-ICING AND ANTI-ICING APPARATUS INCLUDING, A METALLIC SUPPORTING SURFACE, INNER AND OUTER LAYERS OF ELECTRICAL INSULATING MATERIAL A CARBONIZED CLOTH ELECTRICAL RESISTANCE HEATING ELEMENT INTERPOSED BETWEEN THE INNER AND OUTER LAYERS OF INSULATING MATERIAL, SAID HEATING ELEMENT COMPRISING WOVEN THREADS HAVING
Claim 2
Dependent Claim
43 words
ELECTRICALLY HEATED DE-ICING AND ANTI-ICING APPARATUS INCLUDING, A METALLIC SUPPORTING SURFACE, INNER AND OUTER LAYERS OF ELECTRICAL INSULATING MATERIAL A CARBONIZED CLOTH ELECTRICAL RESISTANCE HEATING ELEMENT INTERPOSED BETWEEN THE INNER AND OUTER LAYERS OF INSULATING MATERIAL, SAID HEATING ELEMENT COMPRISING WOVEN THREADS HAVING
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |