Patent US2425403A successfully refreshed from Google Patents.
US2425403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluogermanate glass
Assignee: Eastman Kodak Co
•
Filing: 1946-01-29
•
Granted: 1947-08-12
•
Expires: 1966-01-29
Abstract
No abstract record available.
Inventors
- 👤 Sun Kuan-Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/253; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |