Patent US2996392A successfully refreshed from Google Patents.
US2996392A
Expired / Lapsed
US
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Optical glass
Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1958-04-16
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Granted: 1961-08-15
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Expires: 1978-04-16
Abstract
No abstract record available.
Inventors
- 👤 Bromer Heinz
- 👤 Meinert Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/15; C03C3/155; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
OPTICAL GLASS CONTAINING, AS GLASS FORMER, FROM 16 TO 32 PERCENT BY WEIGHT OF BORIC OXIDE, FROM 25 TO 50 PERCENT BY WEIGHT OF LANTHANUM OXIDE AND FROM 10.4 TO 23 PERCENT BY WEIGHT OF ALUMINUM OXIDE.
Claim 2
Dependent Claim
37 words
OPTICAL GLASS CONTAINING, AS GLASS FORMER, FROM 16 TO 32 PERCENT BY WEIGHT OF BORIC OXIDE, FROM 25 TO 50 PERCENT BY WEIGHT OF LANTHANUM OXIDE AND FROM 10.4 TO 23 PERCENT BY WEIGHT OF ALUMINUM OXIDE.
References Cited (Backward Citations)
CA493137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |