US2511228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead borate glass
Assignee: Eastman Kodak Co
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Filing: 1947-03-26
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Granted: 1950-06-13
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Expires: 1967-03-26
Abstract
No abstract record available.
Inventors
- 👤 Sun Kuan-Han
- 👤 Thomas E Callear
- 👤 Philip T Scharf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:12
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/12; C03C3/14; C03C3/145; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AN OPTICAL BORATE GLASS HAVING AN INDEX OF REFRACTION BETWEEN 1.6 AND 1.7 AND AN ABBE VALUE BETWEEN 40 AND 45, CONSISTING OF THE HEAT REACTION PRODUCT OF A BATCH OF OXIDES IN WHICH THERE IS A CATIONIC PERCENTAGE OF BERYLLIUM BETWEEN 5 PERCENT AND 25 PERCENT, A CATIONIC PERCENTAGE OF LEAD BETWEEN 5 PERCENT AND 25 PERCENT, A CATIONIC PERCENTAGE OF BORON BETWEEN 50 PERCENT AND 90 PERCENT NOT OVER 10 PER CENT BEING SILICON AND
Claim 2
Dependent Claim
77 words
AN OPTICAL BORATE GLASS HAVING AN INDEX OF REFRACTION BETWEEN 1.6 AND 1.7 AND AN ABBE VALUE BETWEEN 40 AND 45, CONSISTING OF THE HEAT REACTION PRODUCT OF A BATCH OF OXIDES IN WHICH THERE IS A CATIONIC PERCENTAGE OF BERYLLIUM BETWEEN 5 PERCENT AND 25 PERCENT, A CATIONIC PERCENTAGE OF LEAD BETWEEN 5 PERCENT AND 25 PERCENT, A CATIONIC PERCENTAGE OF BORON BETWEEN 50 PERCENT AND 90 PERCENT NOT OVER 10 PER CENT BEING SILICON AND
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) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |