US3745032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low expansion,multiband transmitting glass
Assignee: General Dynamics Corp
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Filing: 1971-09-20
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Granted: 1973-07-10
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Expires: 1991-09-20
Abstract
Abstract GLASS COMPOSITIONS ARE DISCLOSED WHICH HAVE LOW THERMAL EXPANSION CHARACTERISTICS AND EXCELLENT INFRARED AND ULTRAVIOLET OR RADIO FREQUENCY TRANSMITTANCE CHARACTERISTICS. THESE COMPOSITIONS ARE USEFUL IN MANUFACTURING DOMES SUITABLE FOR HOUSING INFRARED AND ULTRAVIOLET OR RADIO FREQUENCY DETECTORS SUCH AS ARE USED IN MISSILE SYSTEMS. THE GLASSES ARE BASICALLY GERMANIUM OXIDE GLASSES INCLUDING SUITABLE AMOUNTS OF ALKALI OXIDES, ZINC OXIDE, CALCIUM OXIDE, ZIRCONIUM OXIDE, ALUMINUM OXIDE AND OTHERS. THE ADDITION OF CERTAIN RARE-EARTH OXIDES, SUCH AS YTTERBIUM OXIDE, GIVE A DESIRABLE INCREASE IN SURFACE HARDNESS.
Inventors
- 👤 R Miller
- 👤 S Colburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/253; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S501/905; Y10S501/906
Claims Analysis
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |