US2812273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making titanium-dioxide rectifiers
Assignee: Individual
•
Filing: 1955-06-09
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Granted: 1957-11-05
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Expires: 1975-06-09
Abstract
No abstract record available.
Inventors
- 👤 Theodore S Shilliday
- 👤 Charles S Peet
- 👤 Arthur E Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:35
CPC Classifications
C; C23; C23C; C23C22/00; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
IN THE PROCESS OF PRODUCING SEMICONDUCTING TITANIUM DIOXIDE BY THE OXIDATION OF TITANIUM METAL, THE IMPROVEMENT IN COMBINATION WITH SAID OXIDATION OF CONTACTING THE TITANIUM METAL WITH HYDROCHLORIC ACID PRIOR TO TO OXIDATION AND THEN AIR-DRYING THE METAL PRIOR TO OXIDATION.
Claim 2
Dependent Claim
41 words
IN THE PROCESS OF PRODUCING SEMICONDUCTING TITANIUM DIOXIDE BY THE OXIDATION OF TITANIUM METAL, THE IMPROVEMENT IN COMBINATION WITH SAID OXIDATION OF CONTACTING THE TITANIUM METAL WITH HYDROCHLORIC ACID PRIOR TO TO OXIDATION AND THEN AIR-DRYING THE METAL PRIOR TO OXIDATION.
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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |