US4052588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater panel
Assignee: Nippon Kinzoku Co Ltd
•
Filing: 1975-03-21
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Granted: 1977-10-04
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Expires: 1995-03-21
Abstract
Abstract A panel heater with a flat metal sheet of substantially even thickness of from 0.06 to 0.2 mm and having a mesh-like radiation section formed in the central portion of the sheet, the mesh-like radiation section being composed of a plurality of units of wave-like current passageways of uniform width of approximately 2 mm from one end to the other, arranged parallel to each other and connected to each other at the crests of the wave-like current passageways so that the combined width of the passageways at the crests is twice the uniform width. The panel heater also has a pair of heat resistant boards between which the metal sheet is sandwiched; and a frame assembly joining together the heat resistant boards.
Inventors
- 👤 Tatsuji Nakamura
- 👤 Kenji Fukuda
- 👤 Toshihiko Tsuji
- 👤 Takeo Maruyama
- 👤 Ryouji Sakai
- 👤 Shohei Sawada
- 👤 Haruki Miyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:46
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/04; F24C7/043; A; A47; A47K; A47K10/00; A47K10/04; A47K10/06; H; H05; H05B; H05B3/00; H05B3/10; H05B3/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A panel heater comprising: a flat metal sheet of substantially even thickness of form 0.06 to 0.2 mm; having electrode terminals at two opposite ends of said sheet and a mesh-like radiation section formed in the central portion of said sheet, said mesh-like radiation section being composed of a plurality of units of wave-like current passageways, each unit having a uniform width of approximately 2mm from one end to the other, said units being arranged parallel to each other and connected to each other at the crests of said wave-like current passageways so that the combined width of said passageways at said crests is twice said uniform width; a pair of heat resistant boards between which said metal sheet is sandwiched; and a frame assembly joining together said heat resistant boards.
Claim 2
Dependent Claim
131 words
A panel heater comprising: a flat metal sheet of substantially even thickness of form 0.06 to 0.2 mm; having electrode terminals at two opposite ends of said sheet and a mesh-like radiation section formed in the central portion of said sheet, said mesh-like radiation section being composed of a plurality of units of wave-like current passageways, each unit having a uniform width of approximately 2mm from one end to the other, said units being arranged parallel to each other and connected to each other at the crests of said wave-like current passageways so that the combined width of said passageways at said crests is twice said uniform width; a pair of heat resistant boards between which said metal sheet is sandwiched; and a frame assembly joining together said heat resistant boards.
Claim 3
Dependent Claim
19 words
A panel heater according to claim 1 wherein said metal sheet is spatially sandwiched between said heat resistant boards.
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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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |