US3277419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated heating unit
Assignee: EIDP Inc
•
Filing: 1963-11-20
•
Granted: 1966-10-04
•
Expires: 1983-11-20
Abstract
No abstract record available.
Inventors
- 👤 Butz Charles Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A HEATING UNIT HAVING AN ELECTRICALLY RESISTIVE HOMOGENEOUS LAYER OF BIAXIALLY ORIENTED POLYTETRAFLUOROETHYLENE RESIN HAVING FROM 5 TO 95% BY VOLUME OF ELECTRICALLY RESISTIVE PARTICULATE FIL.LER SELECTED FROM THE GROUP CONSISTING OF CARBON BLACK, GRAPHITE, BRONZE AND COPPER, AND FROM 0 TO 75% BY VOLUME OF PARTICULATE SILICA FILLER, SAID LAYER HAVING AN "A" X-RAY RATION OF FROM 1 TO 0.4 AND A "B" X-RAY RATIO OF FROM 0.7 TO 0.05 AND HAVING ELECTRODES CONNECTED THERETO CHARACTERIZED IN THAT SAID UNIT POSSESSES UNIFORM ANISOTROPIC RESISTIVE PROPERTIES AND PRODUCES UNIFORM HEATING.
Claim 2
Dependent Claim
90 words
A HEATING UNIT HAVING AN ELECTRICALLY RESISTIVE HOMOGENEOUS LAYER OF BIAXIALLY ORIENTED POLYTETRAFLUOROETHYLENE RESIN HAVING FROM 5 TO 95% BY VOLUME OF ELECTRICALLY RESISTIVE PARTICULATE FIL.LER SELECTED FROM THE GROUP CONSISTING OF CARBON BLACK, GRAPHITE, BRONZE AND COPPER, AND FROM 0 TO 75% BY VOLUME OF PARTICULATE SILICA FILLER, SAID LAYER HAVING AN "A" X-RAY RATION OF FROM 1 TO 0.4 AND A "B" X-RAY RATIO OF FROM 0.7 TO 0.05 AND HAVING ELECTRODES CONNECTED THERETO CHARACTERIZED IN THAT SAID UNIT POSSESSES UNIFORM ANISOTROPIC RESISTIVE PROPERTIES AND PRODUCES UNIFORM HEATING.
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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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |