Patent US709857A successfully refreshed from Google Patents.
Patent US4681996A successfully refreshed from Google Patents.
US3541018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared-excitable ytterbium sensitized erbium or thulium activated rare earth flouride luminescent material
Assignee: General Electric Co
•
Filing: 1968-09-18
•
Granted: 1970-11-17
•
Expires: 1988-09-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Hewes
- 👤 James F Sarver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7772
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3233189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |