US2691601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor treatment
Assignee: GTE Sylvania Inc
•
Filing: 1950-03-10
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Granted: 1954-10-12
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Expires: 1970-03-10
Abstract
No abstract record available.
Inventors
- 👤 Keith H Butler
- 👤 Horace H Homer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/72; C09K11/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
THE METHOD OF TREATING A CALCIUM HALOPHOSPHATE ACTIVATED BY MANGANESE AND ANTIMONY PHOSHOR TO INCREASE ITS LUMINESCENT BRIGHTNESS, WHICH COMPRISES WASHING IN AN AQUEOUS SOLUTION OF HYDROCHLORIC ACID, RINSING IN WATER, AND THEN BRINGING THE SOLUTION TO A PH OF 8 BY ADDING A BASIC REAGENT CAPABLE OF LEAVING NO RESIDUE ON SUBSEQUENT HEAT TREATMENT.
Claim 2
Independent Claim
55 words
THE METHOD OF TREATING A CALCIUM HALOPHOSPHATE ACTIVATED BY MANGANESE AND ANTIMONY PHOSHOR TO INCREASE ITS LUMINESCENT BRIGHTNESS, WHICH COMPRISES WASHING IN AN AQUEOUS SOLUTION OF HYDROCHLORIC ACID, RINSING IN WATER, AND THEN BRINGING THE SOLUTION TO A PH OF 8 BY ADDING A BASIC REAGENT CAPABLE OF LEAVING NO RESIDUE ON SUBSEQUENT HEAT TREATMENT.
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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |