US3553834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heating carpet
Assignee: Dow Chemical Co
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Filing: 1968-11-12
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Granted: 1971-01-12
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Expires: 1988-11-12
Abstract
Abstract A METHOD OF MAKING A HEATING CARPET USING A COMPRESSED VERMICULAR GRAPHITE AS A RESISTANCE HEATING ELEMENT WHEREIN A LAYER OF COMPRESSED VERMICULAR GRAPHITE IS APPLIED TO THE BACKING OF A CARPET AND A SECOND BACKING IS ADDED TO COVER THE COMPRESSED GRAPHITE LAYER. ELECTRICAL CONTACT IS THEN MADE BETWEEN THE GRAPHITE LAYER AND AN ELECTRICAL SOURCE TO CAUSE CURRENT TO FLOW THROUGH THE GRAPHITE LAYER THEREBY HEATING THE CARPET BY ELECTRICAL RESISTANCE.
Inventors
- 👤 Franciszek Olstowski
- 👤 John D Watson Sr
- 👤 Wallace T Mcmichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; C01; C01B; C01B32/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083; Y10T428/00; Y10T428/27; Y10T428/31504; Y10T428/31507; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |