US3586642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ptc thermistor of bati03,and other oxides
Assignee: Panasonic Holdings Corp
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Filing: 1968-10-22
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Granted: 1971-06-22
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Expires: 1988-10-22
Abstract
Abstract A PTC THERMISTOR COMPOSITION CONSISTING OF BATIO3, AL2O3, SIO2, TIO2, AND ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF NB2O5, TA2O5, SB2O3, BI2O3, LA2O3, CEO2, GD2O3, SM2O3 AND Y2O3, AND A METHOD OF PRODUCING CERAMIC BODY FOR SAID PTC THERMISTOR COMPRISING MIXING THE CONSTITUENTS, CALCINING, PRESSING THE CALCINED MIXTURE INTO DISKS, FIRING THE DISKS AT 1240 TO 1400*C. FOR 0.5 TO 5 HOURS, AND COOLING THE FIRED DISKS AT A RATE LOWER THAN 150*C. PER HOUR.
Inventors
- 👤 Yoshihiro Matsuo
- 👤 Eisuke Kurokawa
- 👤 Hiromu Sasaki
- 👤 Shigeru Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; H01C7/00; H01C7/02; H01C7/022; H01C7/023; H01C7/025
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |