US2844693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire-wound vitreous enamel resistors
Assignee: AT&T Inc
•
Filing: 1954-10-25
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Granted: 1958-07-22
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Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Merle D Rigterink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:19
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN ELECTRICAL RESISTOR COMPRISING A METAL RESISTANCE WIRE WOUND ON A CERAMIC CORE, A CERAMIC ENAMEL UNDERCOAT BONDED TO SAID WIRE AND SAID CERAMIC CORE, SAID UNDERCOAT CONSISTING ESSENTIALLY OF A CONTINUOUS VITREOUS PHASE OF AN ENAMEL WHICH IS A MEMBER OF THE GROUP CONSISTING OF ALKALI METAL BOROSILICATE ENAMELS AND LEAD BOROSILICATE ENAMELS, SAID VITREOUS PHASE HAVING FINELY DIVIDED PARTICLES OF REFRACTORY MATERIAL DISPERSED THERETHROUGH, WHICH REFRACTORY MATERIAL CONSTITUTED A SOLID SECOND PHASE WITHIN THE MOLTEN FLUID VITREOUS PHASE DURING FIRING, AND A CERAMIC ENAMEL OUTERCOAT BONDED TO SAID UNDERCOAT, SAID OUTERCOAT CONSISTING ESSENTIALLY OF A LEAD BOROSILICATE ENAMEL.
Claim 2
Dependent Claim
100 words
AN ELECTRICAL RESISTOR COMPRISING A METAL RESISTANCE WIRE WOUND ON A CERAMIC CORE, A CERAMIC ENAMEL UNDERCOAT BONDED TO SAID WIRE AND SAID CERAMIC CORE, SAID UNDERCOAT CONSISTING ESSENTIALLY OF A CONTINUOUS VITREOUS PHASE OF AN ENAMEL WHICH IS A MEMBER OF THE GROUP CONSISTING OF ALKALI METAL BOROSILICATE ENAMELS AND LEAD BOROSILICATE ENAMELS, SAID VITREOUS PHASE HAVING FINELY DIVIDED PARTICLES OF REFRACTORY MATERIAL DISPERSED THERETHROUGH, WHICH REFRACTORY MATERIAL CONSTITUTED A SOLID SECOND PHASE WITHIN THE MOLTEN FLUID VITREOUS PHASE DURING FIRING, AND A CERAMIC ENAMEL OUTERCOAT BONDED TO SAID UNDERCOAT, SAID OUTERCOAT CONSISTING ESSENTIALLY OF A LEAD BOROSILICATE ENAMEL.
References Cited (Backward Citations)
US100725A
Cited
CH231679A
Cited
US2269176A
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US2321840A
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US2396979A
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US2398686A
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US2425032A
Cited
US2475469A
Cited
US2508511A
Cited
US2508735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |