Patent US3421498A successfully refreshed from Google Patents.
Patent US3705819A successfully refreshed from Google Patents.
US3705819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying by induction heating
Assignee: Individual
•
Filing: 1970-06-15
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Granted: 1972-12-12
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Expires: 1990-06-15
Abstract
Abstract THE DRYING OF INKS OR OTHER COATINGS BY HIGH EFFICIENCY HYSTERESIS-TYPE INDUCTION HEATING OF SELECTED OXIDE PARTICLES THEREIN. THE TERMOHYSTERETIC MATERIALS USED ARE GAMMA FE2O3 AND CRO2 WHICH MATERIALS MAY FORM AT LEAST A PORTION OF THE PIGMENT FOR THE INK. THESE MATERIALS EXHIBIT A RELATIVELY HIGH MAGNETIC SATURATION FLUX DENSITY AND A RELATIVELY HIGH COERCIVE FORCE IN THE PREFERRED LOW FREQUENCY INDUCTION HEATING RANGE OF BELOW 5 MEGACYCLYES PER SECOND AND THUS SUBSTANTIAL HEAT CAN BE GENERATED BY MAGNETIC HYSTERESIS LOSS.
Inventors
- 👤 William C Heller Jr
- 👤 Alfred F Leatherman
- 👤 Robert L Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/32; F26B3/34; B; B41; B41M; B41M7/00; B41M7/0054; B41M7/009; Y; Y10; Y10S; Y10S428/00; Y10S428/90
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |