US4013592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature thermistor composition
Assignee: Panasonic Holdings Corp
•
Filing: 1976-02-17
•
Granted: 1977-03-22
•
Expires: 1996-02-17
Abstract
Abstract A high temperature thermistor composition comprising a spinel-type Mg Al2O4 and perovskite-type La CrO3 or (La, Sr) CrO3 is usable for the temperature range from 400 DEG to 600 DEG C, and a high temperature thermistor composition comprising spinel-type solid solution Mg(Al, Cr)2O4 and perovskite-type solid solution (La, Sr) CrO3 or LaCrO3 is usable for a higher temperature range up to 1000 DEG C.
Inventors
- 👤 Tomizo Matsuoka
- 👤 Yoshihiro Matsuo
- 👤 Shigeru Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:25
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/44; H01B; H01B1/00; H01B1/06; H01B1/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A high temperature thermistor composition comprising 10 to 90 mole % of spinel-type MgAl 2 O 4 and 10 to 90 mole % of perovskite-type LaCrO 3 .
Claim 2
Dependent Claim
28 words
A high temperature thermistor composition comprising 10 to 90 mole % of spinel-type MgAl 2 O 4 and 10 to 90 mole % of perovskite-type LaCrO 3 .
Claim 3
Dependent Claim
28 words
A high temperature thermistor composition according to claim 1, wherein La ion in said LaCrO 3 is substituted partially by 5 to 20 atom. % of Sr ion.
Claim 4
Dependent Claim
63 words
A high temperature thermistor composition having the ternary system A.MgAl 2 O 4 --B.MgCr 2 O 4 --C.LaCrO 3 , wherein said composition is defined by the area of FIG. 2 enclosed by following six composition points; ______________________________________
(a) A=0.679 B=0.291 C=0.03
(b) A=0.891 B=0.009 C=0.10
(c) A=0.776 B=0.024 C=0.20
(d) A=0.24 B=0.56 C=0.20
(e) A=0.09 B=0.81 C=0.10
(f) A=0.291 B=0.679 C=0.03.
______________________________________
Claim 5
Dependent Claim
63 words
A high temperature thermistor composition having the ternary system A.MgAl 2 O 4 --B.MgCr 2 O 4 --C.LaCrO 3 , wherein said composition is defined by the area of FIG. 2 enclosed by following six composition points; ______________________________________
(a) A=0.679 B=0.291 C=0.03
(b) A=0.891 B=0.009 C=0.10
(c) A=0.776 B=0.024 C=0.20
(d) A=0.24 B=0.56 C=0.20
(e) A=0.09 B=0.81 C=0.10
(f) A=0.291 B=0.679 C=0.03.
______________________________________
Claim 6
Dependent Claim
66 words
A high temperature thermistor composition having the ternary system A.MgAl 2 O 4 --B.MgCr 2 O 4 --C.(La 1 -y Sr y )CrO 3 , wherein y is defined as 0.05≦y≦0.2, wherein said composition is defined by the area of FIG. 2 enclosed by following four composition points; ______________________________________
(a') A=0.994 B=0.001 C=0.005
(b') A=0.4495 B=0.0005 C=0.55
(c') A=0.0225 B=0.4275 C=0.55
(d') A=0.050 B=0.945 C=0.005.
______________________________________
Claim 7
Dependent Claim
66 words
A high temperature thermistor composition having the ternary system A.MgAl 2 O 4 --B.MgCr 2 O 4 --C.(La 1 -y Sr y )CrO 3 , wherein y is defined as 0.05≦y≦0.2, wherein said composition is defined by the area of FIG. 2 enclosed by following four composition points; ______________________________________
(a') A=0.994 B=0.001 C=0.005
(b') A=0.4495 B=0.0005 C=0.55
(c') A=0.0225 B=0.4275 C=0.55
(d') A=0.050 B=0.945 C=0.005.
______________________________________
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |