US2862891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered electrical resistor
Assignee: US Philips Corp
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Filing: 1955-06-27
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Granted: 1958-12-02
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Expires: 1975-06-27
Abstract
No abstract record available.
Inventors
- 👤 Jonker Gerard Heinrich
- 👤 Gerard Willem Van Oosterhout
- 👤 Jan Heinrik Van Santen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2616; H; H01; H01C; H01C7/00; H01C7/001; H01C7/04; H01C7/042; H01C7/043; H01C7/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A SINSTERED ELECTRICAL RESISTOR HAVING A CONDUCTIVE PHASE CONSISTING OF CRYSTALS HAVING A PEROVSKITE STRUCTURE AND A COMPOSITION CORRESPONDING APPROXIMATELY TO THE FORMULA ABND1-N03 WHEREIN A REPRESENTS A MIXTURE OF AT LEAST ONE TRIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF LA+++, ND+++ AND PR+++ AND AT LEAST ONE BIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF CA++, SR++, BA++ AND PB++; B REPRESENTS AT LEAST ONE TRIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF FE+++, CR+++, AND CO+++, D REPRESENTS AT LEAST ONE TETRAVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF FE++++, CR++++, CO++++ AND MN++++; MN++++, CO+++ AND CO++++ BEING PRESENT ONLY WHEN AT LEAST ONE OF THE OTHER METAL IONS OTHER THAN THE METAL IONS REPRESENTED BY A IN SAID FORMULA IS PRESENT, THE ELEMENTS CO. FE AND CR BEING PRESENT IN BOTH THE TRIVALENT AND TETRAVALENT STATES, AND WHEREIN N REPRESENTS A NUMERAL HAVING A VALUE GREATER THAN ZERO BUT LESS THAN ONE.
Claim 2
Dependent Claim
161 words
A SINSTERED ELECTRICAL RESISTOR HAVING A CONDUCTIVE PHASE CONSISTING OF CRYSTALS HAVING A PEROVSKITE STRUCTURE AND A COMPOSITION CORRESPONDING APPROXIMATELY TO THE FORMULA ABND1-N03 WHEREIN A REPRESENTS A MIXTURE OF AT LEAST ONE TRIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF LA+++, ND+++ AND PR+++ AND AT LEAST ONE BIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF CA++, SR++, BA++ AND PB++; B REPRESENTS AT LEAST ONE TRIVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF FE+++, CR+++, AND CO+++, D REPRESENTS AT LEAST ONE TETRAVALENT METAL ION SELECTED FROM THE GROUP CONSISTING OF FE++++, CR++++, CO++++ AND MN++++; MN++++, CO+++ AND CO++++ BEING PRESENT ONLY WHEN AT LEAST ONE OF THE OTHER METAL IONS OTHER THAN THE METAL IONS REPRESENTED BY A IN SAID FORMULA IS PRESENT, THE ELEMENTS CO. FE AND CR BEING PRESENT IN BOTH THE TRIVALENT AND TETRAVALENT STATES, AND WHEREIN N REPRESENTS A NUMERAL HAVING A VALUE GREATER THAN ZERO BUT LESS THAN ONE.
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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |