US2585461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fluorescent zinc oxide
Assignee: Individual
•
Filing: 1946-01-04
•
Granted: 1952-02-12
•
Expires: 1966-01-04
Abstract
No abstract record available.
Inventors
- 👤 Benjamin L Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:36
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/56; C09K11/562; C09K11/565
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN IMPROVEMENT IN THE PROCESS OF PRODUCING FLUORESCENT ZINC OXIDE BY EXPOSING INCANDESCENT FRENCH PROCESS ZINC OXIDE TO A GASEOUS REDUCING ATMOSPHERE, CHARACTERIZED BY THE STEP OF CONTACTING THE ZINC OXIDE WITH AN ATMOSPHERE CONTAINING SULFUR DIOXIDE WITHIN A TIME RANGING FROM A TIME PRIOR TO AND UP TO AND INCLUDING THE TIME WHEN THE ZINC OXIDE REACHES A STATE OF INCANDESCENCE, THEREBY MAINTAINING A SUBSTANTIALLY CONSTANT ZINC OXIDE PARTICLE SIZE DURING THE EXPOSURE OF THE INCANDESCENT ZINC OXIDE TO A GASEOUS REDUCING ATMOSPHERE.
Claim 2
Dependent Claim
84 words
AN IMPROVEMENT IN THE PROCESS OF PRODUCING FLUORESCENT ZINC OXIDE BY EXPOSING INCANDESCENT FRENCH PROCESS ZINC OXIDE TO A GASEOUS REDUCING ATMOSPHERE, CHARACTERIZED BY THE STEP OF CONTACTING THE ZINC OXIDE WITH AN ATMOSPHERE CONTAINING SULFUR DIOXIDE WITHIN A TIME RANGING FROM A TIME PRIOR TO AND UP TO AND INCLUDING THE TIME WHEN THE ZINC OXIDE REACHES A STATE OF INCANDESCENCE, THEREBY MAINTAINING A SUBSTANTIALLY CONSTANT ZINC OXIDE PARTICLE SIZE DURING THE EXPOSURE OF THE INCANDESCENT ZINC OXIDE TO A GASEOUS REDUCING ATMOSPHERE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |