US3529980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borosilicate optical crown glass with anomalous partial dispersions with negative deltave dispersion values
Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1967-04-28
•
Granted: 1970-09-22
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Expires: 1987-04-28
Abstract
No abstract record available.
Inventors
- 👤 Heinz Bromer
- 👤 Norbert Meinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:19
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/062; C03C3/064; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2576521A
Cited
US2745757A
Cited
US2866712A
Cited
US3174871A
Cited
GB863352A
Cited
US3143432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |