US3128169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making quartz glass casings
Assignee: Heraeus Quarzschmelze GmbH
•
Filing: 1958-10-15
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Granted: 1964-04-07
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Expires: 1978-10-15
Abstract
No abstract record available.
Inventors
- 👤 Heraeus Wilhelm Heinrich
- 👤 Mohn Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:04
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
125 words
IN THE PROCESS FOR MAKING QUARTZ GLASS CASINGS FOR ULTRAVIOLET LAMPS FROM QUARTZ GLASS CONTAINING AMOUNTS OF IMPURITIES, SELECTED FROM THE GROUP CONSISTING OF THE CONDUCTIVE ELEMENTS, CARBON, METALLOIDS, COMPOUNDS CONTAINING SUCH ELEMENTS, INCLUDING THE OXIDES OF SILICON WITH A LOWER OXYGEN CONTENT THAN SILICON DIOXIDE, AND HYDROGEN NORMALLY CAPABLE OF FORMING CENTERS OF RECRYSTALLIZATION INCLUDING THE STEPS, IN WHICH THE GLASS IS HEATED TO A MELTING TEMPERATURE, SHAPED IN THE FORM OF A CASING AND ALLOWED TO SOLIDIFY IN THIS FORM, THE IMPROVEMENT WHICH ESSENTIALLY CONSISTS OF THE COMBINATION WITH SAID STEPS OF REDUCING THE PARTICLE SIZE OF SAID IMPURITIES TO BELOW ABOUT 100U, AND HOMOGENIZING AND UNIFORMLY DISPERSING THE SAME THROUGHOUT SAID QUARTZ GLASS PRIOR TO SOLIDIFICATION IN THE FORM OF SAID CASING.
Claim 2
Dependent Claim
125 words
IN THE PROCESS FOR MAKING QUARTZ GLASS CASINGS FOR ULTRAVIOLET LAMPS FROM QUARTZ GLASS CONTAINING AMOUNTS OF IMPURITIES, SELECTED FROM THE GROUP CONSISTING OF THE CONDUCTIVE ELEMENTS, CARBON, METALLOIDS, COMPOUNDS CONTAINING SUCH ELEMENTS, INCLUDING THE OXIDES OF SILICON WITH A LOWER OXYGEN CONTENT THAN SILICON DIOXIDE, AND HYDROGEN NORMALLY CAPABLE OF FORMING CENTERS OF RECRYSTALLIZATION INCLUDING THE STEPS, IN WHICH THE GLASS IS HEATED TO A MELTING TEMPERATURE, SHAPED IN THE FORM OF A CASING AND ALLOWED TO SOLIDIFY IN THIS FORM, THE IMPROVEMENT WHICH ESSENTIALLY CONSISTS OF THE COMBINATION WITH SAID STEPS OF REDUCING THE PARTICLE SIZE OF SAID IMPURITIES TO BELOW ABOUT 100U, AND HOMOGENIZING AND UNIFORMLY DISPERSING THE SAME THROUGHOUT SAID QUARTZ GLASS PRIOR TO SOLIDIFICATION IN THE FORM OF SAID CASING.
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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) | 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 |