US3856697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent alkali metal gallate
Assignee: US Philips Corp
•
Filing: 1973-10-29
•
Granted: 1974-12-24
•
Expires: 1993-10-29
Abstract
Abstract A luminescent gallate activated by bivalent manganese having a hexagonal crystal structure corresponding to the structure of Beta -alumina and defined by the formula:
Inventors
- 👤 J Verstegen
- 👤 Meester E De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:53
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/646; C09K11/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
A LUMINESCENT ALKALI GALLATE ACTIVATED BY BIVALENT MANGA NESE WHICH HAS A HEXAGONAL CRYSTAL STRUCTURE CORRESPONDING TO THE STRUCTURE OF B-ALUMINA AND WHICH IS DEFINED BY THE FORMULA
Claim 2
Dependent Claim
28 words
A LUMINESCENT ALKALI GALLATE ACTIVATED BY BIVALENT MANGA NESE WHICH HAS A HEXAGONAL CRYSTAL STRUCTURE CORRESPONDING TO THE STRUCTURE OF B-ALUMINA AND WHICH IS DEFINED BY THE FORMULA
Claim 3
Dependent Claim
22 words
A luminescent gallate as claimed in claim 1, characterized in that the gallate is defined by the formula MeIGa11O17 : yMn2 .
Claim 4
Dependent Claim
14 words
A luminescent gallate as claimed in claim 2, characterized in that MeI is K.
Claim 5
Dependent Claim
17 words
A luminescent gallate as claimed in claim 1, characterized in that the gallate is free from aluminum.
Claim 6
Dependent Claim
20 words
A luminescent gallate as claimed in claim 1, characterized in that 0.0005 < or = y < or = 0.05.
References Cited (Backward Citations)
US3499843A
Cited
GB1190520A
Cited
US3595802A
Cited
US3576757A
Cited
US3723339A
Cited
US3635833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |