Patent US2745757A successfully refreshed from Google Patents.
US2745757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Schott AG
•
Filing: 1953-08-03
•
Granted: 1956-05-15
•
Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Geffcken Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:43
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A THORIUM OXIDE, BERYLLIUM OXIDE FREE OPTICAL GLASS WITH A HIGH REFRACTIVE INDEX CONSISTING OF: (A) AT LEAST 36 WEIGHT PER CENT BORON OXIDE; (B) 26-44 WEIGHT PER CENT LANTHANUM OXIDE; (C) 5-19 WEIGHT PER CENT CALCIUM OXIDE; (D) 0-11 WEIGHT PER CENT ZIRCONIUM OXIDE; (E) 0-6 WEIGHT PER CENT OF A BIVALENT BASIC COMPONENT OTHER THAN CALCIUM OXIDE; (F) 0-9 WEIGHT PER CENT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF NIOBIUM OXIDE, TANTALUM OXIDE AND MIXTURES THEREOF: (G) 0-2 WEIGHT PER CENT LITHIUM OXIDE; (H) 0-4 WEIGHT PER CENT OF COMPATIBLE GLASS COMPONENTS; (I) ABOVE 4 TO 10 WEIGHT PER CENT SILICA; THE TOTAL AMOUNTS OF (A) AND (I) NOT EXCEEDING 50 WEIGHT PER CENT, THE AMOUNTS OF (C), (E) AND (G) NOT EXCEEDING A TOTAL OF 19 WEIGHT PER CENT, THE SUM OF (C), (E) AND 2(G) NOT EXCEEDING THE VALUE OF 33 WEIGHT PER CENT MINUS ONE-HALF (B).
Claim 2
Dependent Claim
153 words
A THORIUM OXIDE, BERYLLIUM OXIDE FREE OPTICAL GLASS WITH A HIGH REFRACTIVE INDEX CONSISTING OF: (A) AT LEAST 36 WEIGHT PER CENT BORON OXIDE; (B) 26-44 WEIGHT PER CENT LANTHANUM OXIDE; (C) 5-19 WEIGHT PER CENT CALCIUM OXIDE; (D) 0-11 WEIGHT PER CENT ZIRCONIUM OXIDE; (E) 0-6 WEIGHT PER CENT OF A BIVALENT BASIC COMPONENT OTHER THAN CALCIUM OXIDE; (F) 0-9 WEIGHT PER CENT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF NIOBIUM OXIDE, TANTALUM OXIDE AND MIXTURES THEREOF: (G) 0-2 WEIGHT PER CENT LITHIUM OXIDE; (H) 0-4 WEIGHT PER CENT OF COMPATIBLE GLASS COMPONENTS; (I) ABOVE 4 TO 10 WEIGHT PER CENT SILICA; THE TOTAL AMOUNTS OF (A) AND (I) NOT EXCEEDING 50 WEIGHT PER CENT, THE AMOUNTS OF (C), (E) AND (G) NOT EXCEEDING A TOTAL OF 19 WEIGHT PER CENT, THE SUM OF (C), (E) AND 2(G) NOT EXCEEDING THE VALUE OF 33 WEIGHT PER CENT MINUS ONE-HALF (B).
References Cited (Backward Citations)
US2241249A
Cited
US2584975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |