US2511227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead-containing fluophosphate glass
Assignee: Eastman Kodak Co
•
Filing: 1947-03-26
•
Granted: 1950-06-13
•
Expires: 1967-03-26
Abstract
No abstract record available.
Inventors
- 👤 Sun Kuan-Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:23
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A FLUOPHOSPHATE OPTICAL GLASS CONSISTING OF THE FUSED HEAT REACTION PRODUCT OF A BATCH CONTAINING AS PREDOMINANT AND ESSENTIAL INGREDIENTS IN THE MOLECULAR PERCENTAGES SPECIFIED: ALUMINUM METAPHOSPHATE, 15 TO 40 PER CENT; A FLUORIDE SELECTED FROM THE GROUP CONSISTING OF THE FLUORIDES OF SODIUM AND BARIUM, 25 TO 70 PER CENT; A COMPOUND OF LEAD SELECTED FROM THE GROUP CONSISTING OF LEAD OXIDE AND LEAD FLUORIDE, 10 TO 50 PER CENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |