US2763559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass and process for its production
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1951-11-06
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Granted: 1956-09-18
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Expires: 1971-11-06
Abstract
No abstract record available.
Inventors
- 👤 Weissenberg Gustav
- 👤 Meinert Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/12; C03C3/122; C03C3/23; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
OPTICAL GLASS CONSISTING ESSENTIALLY OF ELEMENTS IN THE FOLLOWING RANGE BY PERCENTAGE BY WEIGHTS:
Claim 2
Dependent Claim
14 words
OPTICAL GLASS CONSISTING ESSENTIALLY OF ELEMENTS IN THE FOLLOWING RANGE BY PERCENTAGE BY WEIGHTS:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |