Patent US2882187A successfully refreshed from Google Patents.
US2882187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating element
Assignee: Therm O Lab Corp
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Filing: 1955-09-06
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Granted: 1959-04-14
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Expires: 1975-09-06
Abstract
No abstract record available.
Inventors
- 👤 Kwate Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:37
CPC Classifications
C; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN AN ELECTRICAL HEATING ELEMENT, THE COMBINATION OF: A METALLIC BASE MEMBER HAVING GIVEN THERMAL EXPANSION CHARACTERISTICS; A COATING OF VITREOUS ENAMEL BONDED TO A SURFACE AREA OF SAID BASE MEMBER; AND A LAYER COMPRISING LOW MELTING GLASS FRIT AND ELECTRICALLY CONDUCTIVE METALLIC PARTICLES IN SUBSTANTIALLY EQUAL PROPORTION FIRED ONTO SAID COATING, SAID METALLIC PARTICLES BEING PREDOMINANTLY NICKEL AND SAID GLASS FRIT BEING OF A COMPOSITION SUCH THAT IS THERMAL EXPANSION CHARACTERISTICS ARE EQUIVALENT TO SAID EXPANSION CHARACTERISTICS OF SAID BASE MEMBER, WHEREBY PROPER ADHESION WILL BE MAINTAINED BETWEEN SAID MEMBER AND SAID LAYER THROUGHOUT A WIDE TEMPERATURE RANGE.
Claim 2
Dependent Claim
99 words
IN AN ELECTRICAL HEATING ELEMENT, THE COMBINATION OF: A METALLIC BASE MEMBER HAVING GIVEN THERMAL EXPANSION CHARACTERISTICS; A COATING OF VITREOUS ENAMEL BONDED TO A SURFACE AREA OF SAID BASE MEMBER; AND A LAYER COMPRISING LOW MELTING GLASS FRIT AND ELECTRICALLY CONDUCTIVE METALLIC PARTICLES IN SUBSTANTIALLY EQUAL PROPORTION FIRED ONTO SAID COATING, SAID METALLIC PARTICLES BEING PREDOMINANTLY NICKEL AND SAID GLASS FRIT BEING OF A COMPOSITION SUCH THAT IS THERMAL EXPANSION CHARACTERISTICS ARE EQUIVALENT TO SAID EXPANSION CHARACTERISTICS OF SAID BASE MEMBER, WHEREBY PROPER ADHESION WILL BE MAINTAINED BETWEEN SAID MEMBER AND SAID LAYER THROUGHOUT A WIDE TEMPERATURE RANGE.
References Cited (Backward Citations)
US617375A
Cited
US2112968A
Cited
US2112969A
Cited
US1990812A
Cited
US2103598A
Cited
US2457678A
Cited
US2461878A
Cited
US2530217A
Cited
US2491854A
Cited
US2457158A
Cited
US2557545A
Cited
GB715528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |