US2854413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphors
Assignee: EIDP Inc
•
Filing: 1953-08-13
•
Granted: 1958-09-30
•
Expires: 1973-08-13
Abstract
No abstract record available.
Inventors
- 👤 Geary Charles Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:03
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
FINELY DIVIDED ZINC SULFIDE PHOSPHORS HAVING PARTICLE SIZES RANGING FROM 2 TO 50 MICRONS, SAID PARTICLES HAVING A THIN SURFACE COATING COMPRISING MAGNESIUM BASIC CARBONATE IN AN AMOUNT CORRESPONDING TO FROM 0.5% TO 10.0% BY WEIGHT OF THE PHOSPHORS.
Claim 2
Dependent Claim
39 words
FINELY DIVIDED ZINC SULFIDE PHOSPHORS HAVING PARTICLE SIZES RANGING FROM 2 TO 50 MICRONS, SAID PARTICLES HAVING A THIN SURFACE COATING COMPRISING MAGNESIUM BASIC CARBONATE IN AN AMOUNT CORRESPONDING TO FROM 0.5% TO 10.0% BY WEIGHT OF THE PHOSPHORS.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |