US3309477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective means for encased electrical apparatus
Assignee: McGraw Edison Co
•
Filing: 1964-11-25
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Granted: 1967-03-14
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Bronikowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:20
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/0241; H01H2085/0225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN COMBINATION, AN ENCASED ELECTRICAL APPARATUS HAVING A METALLIC CASING, A TUBULAR INSULATING BUSHING EXTENDING THROUGH AN APERTURE IN A WALL PORTION OF SAID CASING, A CURRENT LIMITING FUSE MOUNTED WITHIN AN AXIAL OPENING IN SAID BUSHING, SAID FUSE INCLUDING A HOLLOW INSULATING HOUSING, A FUSIBLE ELEMENT WITHIN SAID HOUSING ELECTRICALLY CONNECTED AT ONE END TO SAID APPARATUS AND EXTENDING THROUGH SAID APERTURE AND ON OPPOSITE SIDES OF SAID WALL PORTION OF SAID CASING WHICH WALL PORTION IS AT GROUND POTENTIAL, HIGH DIELECTRIC STRENGTH GRANULAR MATERIAL WITHIN SAID HOUSING EMBEDDING SAID FUSIBLE ELEMENT, AND A CONDUCTIVE COATING ON SAID HOUSING IN SURROUNDING RELATIONSHIP TO SAID FUSIBLE ELEMENT AND ELECTRICALLY CONNECTED TO ONE END ONLY OF SAID FUSIBLE ELEMENT AND DISPOSED AT THE POINT OF EXTENSION OF SAID FUSIBLE ELEMENT THROUGH SAID WALL PORTION OF SAID CASING.
Claim 2
Dependent Claim
136 words
IN COMBINATION, AN ENCASED ELECTRICAL APPARATUS HAVING A METALLIC CASING, A TUBULAR INSULATING BUSHING EXTENDING THROUGH AN APERTURE IN A WALL PORTION OF SAID CASING, A CURRENT LIMITING FUSE MOUNTED WITHIN AN AXIAL OPENING IN SAID BUSHING, SAID FUSE INCLUDING A HOLLOW INSULATING HOUSING, A FUSIBLE ELEMENT WITHIN SAID HOUSING ELECTRICALLY CONNECTED AT ONE END TO SAID APPARATUS AND EXTENDING THROUGH SAID APERTURE AND ON OPPOSITE SIDES OF SAID WALL PORTION OF SAID CASING WHICH WALL PORTION IS AT GROUND POTENTIAL, HIGH DIELECTRIC STRENGTH GRANULAR MATERIAL WITHIN SAID HOUSING EMBEDDING SAID FUSIBLE ELEMENT, AND A CONDUCTIVE COATING ON SAID HOUSING IN SURROUNDING RELATIONSHIP TO SAID FUSIBLE ELEMENT AND ELECTRICALLY CONNECTED TO ONE END ONLY OF SAID FUSIBLE ELEMENT AND DISPOSED AT THE POINT OF EXTENSION OF SAID FUSIBLE ELEMENT THROUGH SAID WALL PORTION OF SAID CASING.
References Cited (Backward Citations)
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US2567768A
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US2667549A
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US2877322A
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US3015008A
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |