US2819977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared transmitting fluoride glass
Assignee: Eastman Kodak Co
•
Filing: 1955-07-01
•
Granted: 1958-01-14
•
Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
- 👤 Paolis Paul F De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:12
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/32; C03C3/325; C03C3/326; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/902; Y10S501/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A GLASS RESULTING FROM FUSION OF A BATCH FREE OF THORIUM AND CERIUM, AND CONSISTING OF FLUORIDES INCLUDING THE FOLLOWING FLUORIDES IN THE PERCENTAGES BY WEIGHT GIVEN: MAGNESIUM 6 TO 13 PERCENT, ALUMINUM 15 TO 25
Claim 2
Dependent Claim
36 words
A GLASS RESULTING FROM FUSION OF A BATCH FREE OF THORIUM AND CERIUM, AND CONSISTING OF FLUORIDES INCLUDING THE FOLLOWING FLUORIDES IN THE PERCENTAGES BY WEIGHT GIVEN: MAGNESIUM 6 TO 13 PERCENT, ALUMINUM 15 TO 25
References Cited (Backward Citations)
US2511224A
Cited
US2466509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |