US3458455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating objects of oxidic,ceramic,polycrystalline materials
Assignee: US Philips Corp
•
Filing: 1965-10-13
•
Granted: 1969-07-29
•
Expires: 1985-10-13
Abstract
No abstract record available.
Inventors
- 👤 Gerard Heinrich Jonker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; H01C7/023; H01C7/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF IMPROVING THE PROPERTIES OF A CONTROLLEDVALENCE OXIDE SEMICONDUCTOR CONSTITUTED AT LEAST IN PART OF A CERAMIC, POLYCRYSTALLINE, FERROELECTRIC MATERIAL EXHIBIING A RESISTIVITY IN THE SEMICONDUCTIVE RANGE AND A POSITIVE TEMPERATURE COEFFICIENT OF ELECTRICAL RESISTANCE UP TO AND IN EXCESS OF ITS FERROELCTRIC CURIE TEMPERATURE, COMPRISING THE STEP OF HEATING THE SAID SEMICONDUCTIVE MATERIAL AT AN ELEVATED TEMPERATURE LYING BETWEEN 750*C. AND 1200*C. WHILE EXPOSED TO AT LEAST ONE HALOGEN SELECTED FROM THE GROUP CONSISTING OF FLUORINE, CHLORINE AND BROMINE.
Claim 2
Independent Claim
82 words
A METHOD OF IMPROVING THE PROPERTIES OF A CONTROLLEDVALENCE OXIDE SEMICONDUCTOR CONSTITUTED AT LEAST IN PART OF A CERAMIC, POLYCRYSTALLINE, FERROELECTRIC MATERIAL EXHIBIING A RESISTIVITY IN THE SEMICONDUCTIVE RANGE AND A POSITIVE TEMPERATURE COEFFICIENT OF ELECTRICAL RESISTANCE UP TO AND IN EXCESS OF ITS FERROELCTRIC CURIE TEMPERATURE, COMPRISING THE STEP OF HEATING THE SAID SEMICONDUCTIVE MATERIAL AT AN ELEVATED TEMPERATURE LYING BETWEEN 750*C. AND 1200*C. WHILE EXPOSED TO AT LEAST ONE HALOGEN SELECTED FROM THE GROUP CONSISTING OF FLUORINE, CHLORINE AND BROMINE.
References Cited (Backward Citations)
US3111414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |