US2882187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating element
Assignee: Therm O Lab Corp
•
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
2026-10-24 00:51
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.
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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) | 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 |