Patent US3029152A successfully refreshed from Google Patents.
US3029152A
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Optical glass
Assignee: Pilkington Group Ltd
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Filing: 1958-11-19
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Granted: 1962-04-10
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Expires: 1978-11-19
Abstract
No abstract record available.
Inventors
- 👤 Milne Alexander James
- 👤 Parry Richard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:08
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/253; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/07; C03C3/072; C03C3/074; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903; Y10S501/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
AN OPTICAL GLASS CONSISTING ESSENTIALLY OF BY WEIGHT FROM 20 TO 50% GERMANIUM OXIDE (GEO2), FROM 30 TO 50% LATHANUM OXIDE (LA2O3), AND FRO, 0.5 TO 10% OF BORIC OXIDE (B2O3), THE GLASS HAVING A REFRACTIVE INDEX (ND) OF FROM 1.80 TO 1.94 AND AN ABBE VALUE OF FROM 32 TO 43.
Claim 2
Dependent Claim
52 words
AN OPTICAL GLASS CONSISTING ESSENTIALLY OF BY WEIGHT FROM 20 TO 50% GERMANIUM OXIDE (GEO2), FROM 30 TO 50% LATHANUM OXIDE (LA2O3), AND FRO, 0.5 TO 10% OF BORIC OXIDE (B2O3), THE GLASS HAVING A REFRACTIVE INDEX (ND) OF FROM 1.80 TO 1.94 AND AN ABBE VALUE OF FROM 32 TO 43.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |