Patent US2387864A successfully refreshed from Google Patents.
Patent US3726713A successfully refreshed from Google Patents.
US3726713A
Expired / Lapsed
US
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Methods of treating electrical heating elements
Assignee: Hoover Co
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Filing: 1970-02-09
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Granted: 1973-04-10
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Expires: 1990-02-09
Abstract
Abstract METHODS OF AND APPARATUS FOR TREATING AN ELECTRIC RESISTANCE HEATING ELEMENT OF THE TYPE HAVING AN OPENENDED METALLIC SHEATH FILLED WITH COMPACTED, ELECTRIC-INSULATING, HEAT-CONDUCTIVE MATERIAL IN WHICH IS EMBEDDED AN ELECTRICAL CONDUCTOR, WHEREBY ELECTRICAL LEAKAGE BETWEEN THE METALLIC SHEATH AND THE ELECTRICAL CONDUCTOR IS REDUCED. THE PRESENT INVENTION PROVIDES FOR THE INTRODUCTION OF AMOISTURE-PROTECTIVE FLUID, SUCH AS SILICONE OIL, INTO THE HEATING ELEMENT SHEATH UNDER PRESSURE TO ACHIEVE MAXIMUM DISPERSION OF SUCH FLUID THROUGH THE COMPACTED MATERIAL.
Inventors
- 👤 G Hawk
- 👤 F Martin
- 👤 T Poulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |