Patent US5169391A successfully refreshed from Google Patents.
US2861014A
Expired / Lapsed
US
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Process of making a semi-conductive ceramic body
Assignee: GEN LAB ASSOCIATES Inc
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Filing: 1956-08-14
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Granted: 1958-11-18
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Expires: 1976-08-14
Abstract
No abstract record available.
Inventors
- 👤 Shay J Sheheen
- 👤 Edward L Mooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:51
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; H; H01; H01T; H01T13/00; H01T13/52; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
THE PROCESS OF MAKING A CERAMIC ELELMENT USUABLE IN A SPARK-PRODUCING DEVICE, WHICH COMPRISES THE STEPS OF APPLYING TO A PREDETERMINED SURFACE PORTION OF A BODY OF NON-CONDUCTING REFRACTORY OXIDE MATERIAL A FIRST COATING, THE ESSENTIAL ACTIVE INGREDIENTS OF WHICH ARE CUPROUS OXIDE AND CALCIUM OXIDE, FIRING SAID FIRST COATING ON SAID BODY IN A NON-REDUCING ATMOSPHERE FOR ABOUT ONE-HALF HOUR TO AN HOUR AT A TEMPERATURE IN THE RANGE OF ABOUT 2300*F. TO ABOUT 2600*F., THEREAFTER APPLYING ONTO AT LEAST A PART OF SAID PREDETERMINED SURFACE PORTION A SECOND COATING, THE ESSENTIAL ACTIVE INGREDIENTS OF WHICH ARE CUPROUS OXIDE AND AN ALKALINE EARTH METAL CHROMATE, AND FIRING SAID SECOND COATING ONTO SAID BODY IN AN OXIDIZING ATMOSPHERE FOR ABOUT ONE-HALF HOUR TO AN HOUR AT A TEMPERATURE IN THE RANGE OF ABOUT 1900*F. TO ABOUT 2300* F., SO AS TO PRODUCE ON SAID SELECTED PORTION OF SAID ELEMENT AN IMPREGNATED AREA HAVING AN ELECTRICAL RESISTANCE OF ABOUT 5,000-30,000 OHMS BETWEEN POINTS 0.04 INCH APART.
Claim 2
Dependent Claim
165 words
THE PROCESS OF MAKING A CERAMIC ELELMENT USUABLE IN A SPARK-PRODUCING DEVICE, WHICH COMPRISES THE STEPS OF APPLYING TO A PREDETERMINED SURFACE PORTION OF A BODY OF NON-CONDUCTING REFRACTORY OXIDE MATERIAL A FIRST COATING, THE ESSENTIAL ACTIVE INGREDIENTS OF WHICH ARE CUPROUS OXIDE AND CALCIUM OXIDE, FIRING SAID FIRST COATING ON SAID BODY IN A NON-REDUCING ATMOSPHERE FOR ABOUT ONE-HALF HOUR TO AN HOUR AT A TEMPERATURE IN THE RANGE OF ABOUT 2300*F. TO ABOUT 2600*F., THEREAFTER APPLYING ONTO AT LEAST A PART OF SAID PREDETERMINED SURFACE PORTION A SECOND COATING, THE ESSENTIAL ACTIVE INGREDIENTS OF WHICH ARE CUPROUS OXIDE AND AN ALKALINE EARTH METAL CHROMATE, AND FIRING SAID SECOND COATING ONTO SAID BODY IN AN OXIDIZING ATMOSPHERE FOR ABOUT ONE-HALF HOUR TO AN HOUR AT A TEMPERATURE IN THE RANGE OF ABOUT 1900*F. TO ABOUT 2300* F., SO AS TO PRODUCE ON SAID SELECTED PORTION OF SAID ELEMENT AN IMPREGNATED AREA HAVING AN ELECTRICAL RESISTANCE OF ABOUT 5,000-30,000 OHMS BETWEEN POINTS 0.04 INCH APART.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |