Patent US2689830A successfully refreshed from Google Patents.
US2689830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burn-resistant luminescent product and method of making the same
Assignee: Lanteris Space LLC
•
Filing: 1951-02-26
•
Granted: 1954-09-21
•
Expires: 1971-02-26
Abstract
No abstract record available.
Inventors
- 👤 Sadowsky Meier
- 👤 Miriam G Groner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:30
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0888; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A PHOSPHOR MATERIAL POSSESSING MARKED RESISTANCE TO DARKENING IN THE PRESENCE OF RADIATION COMPRISING CRYSTALLINE PHOSPHOR MATERIAL HAVING A PERSULFATE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM PERSULFATE AND POTASSIUM PERSULFATE ADSORBED ON THE CRYSTALLINE STRUCTURE THEREOF AND RESULTING FROM WETTING SAID PHOSPHOR WITH A SOLUTION OF SAID PERSULFATE IN A CONCENTRATION OF AT LEAST ABOUT 0.1%, BY WEIGHT.
References Cited (Backward Citations)
US2119309A
Cited
US2161458A
Cited
US2312265A
Cited
US2451590A
Cited
US2523026A
Cited
US2573051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |