Patent EP0994470A2 successfully refreshed from Google Patents.
Patent US2041966A successfully refreshed from Google Patents.
US3128166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing quartz glass
Assignee: Heraeus Quarzschmelze GmbH
•
Filing: 1958-10-15
•
Granted: 1964-04-07
•
Expires: 1978-10-15
Abstract
No abstract record available.
Inventors
- 👤 Mohn Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:41
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/049; C03B19/00; C03B19/01; C03B23/047; H; H01; H01J; H01J5/00; H01J5/02; H01J5/04; H01J61/00; H01J61/02; H01J61/30; H01J61/302; H01J9/00; H01J9/24; H01J9/245; H01J9/247; Y; Y10; Y10S; Y10S65/00; Y10S65/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
PROCESS OF PRODUCING A QUARTZ GLASS OF IMPROVED ULTRA-VIOLET RADIATION TRANSMISSION EFFICIENCY OVER EXTENDED PERIODS OF ULTRA-VIOLET RADIATION EXPOSURE, WHICH COMPRISES MAINTAINING A QUARTZ GLASS MATERIAL AT A TEMPERATURE OF AT LEAST ABOUT 1600*C. AND INTIMATELY CONTACTING SUCH MATERIAL, WHILE AT SAID TEMPERATURE, WITH A GAS SELECTED FROM THE GROUP CONSISTING OF CHLORINE, FLUORINE AND GASES YIELDING SUCH HALOGENS BY DECOMPOSITION AT SAID TEMPERATURE, FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE ANY HYDROGEN WHICH MAY BE PRESENT IN SAID MATERIAL AND AT LEAST THOSE PARTICLES NORMALLY PRESENT IN SUCH MATERIAL OF SIZE ABOVE ABOUT 100U OF IMPURITIES REACTABLE WITH SAID GAS TO FORM HALOGENIDES VOLATILE AT SAID TEMPERATURE.
Claim 2
Dependent Claim
110 words
PROCESS OF PRODUCING A QUARTZ GLASS OF IMPROVED ULTRA-VIOLET RADIATION TRANSMISSION EFFICIENCY OVER EXTENDED PERIODS OF ULTRA-VIOLET RADIATION EXPOSURE, WHICH COMPRISES MAINTAINING A QUARTZ GLASS MATERIAL AT A TEMPERATURE OF AT LEAST ABOUT 1600*C. AND INTIMATELY CONTACTING SUCH MATERIAL, WHILE AT SAID TEMPERATURE, WITH A GAS SELECTED FROM THE GROUP CONSISTING OF CHLORINE, FLUORINE AND GASES YIELDING SUCH HALOGENS BY DECOMPOSITION AT SAID TEMPERATURE, FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE ANY HYDROGEN WHICH MAY BE PRESENT IN SAID MATERIAL AND AT LEAST THOSE PARTICLES NORMALLY PRESENT IN SUCH MATERIAL OF SIZE ABOVE ABOUT 100U OF IMPURITIES REACTABLE WITH SAID GAS TO FORM HALOGENIDES VOLATILE AT SAID TEMPERATURE.
References Cited (Backward Citations)
US1003271A
Cited
US1169681A
Cited
US1621446A
Cited
US1782169A
Cited
GB325386A
Cited
DE567863C
Cited
US2070161A
Cited
US2233155A
Cited
US2612727A
Cited
GB752774A
Cited
US2794301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |