US2904713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casings for gas discharge tubes and lamps and process
Assignee: Heraeus Quarzschmelze GmbH
•
Filing: 1953-11-25
•
Granted: 1959-09-15
•
Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Heraeus Wilhelm Heinrich
- 👤 Mohn Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:23
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/047; C03B19/00; C03B19/01; C03B23/049; C03C; C03C3/00; C03C3/04; C03C3/06; H; H01; H01J; H01J5/00; H01J5/02; H01J5/04; C03C2201/00; C03C2201/02; C03C2203/00; C03C2203/40; C03C2203/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN AN ULTRAVIOLET LIGHT LAMP HAVING A FUSED QUARTZ GLASS CASING WITH ELECTRODES SEALED THEREIN, THE IMPROVEMENT WHICH COMPRISES SAID FUSED GLASS CASING BEING CONSITUTED OF SUBSTANTIALLY PURE QUARTZ GLASS FREE OF CONDUCTIVE ELEMENTS, CARBON, METALLOIDS, COMPOUNDS CONTAINING SUCH ELEMENTS, HYDROGEN, AND OXIDES OF SILICON WITH A LOWER OXYGEN CONTENT THAN SILICON DIOXIDE IN AMOUNTS CAPABLE OF FORMING CENTERS OF RECRYSTALLIZATION SAID QUARTZ GLASS BEING CHARACTERIZED BY A CONSIDERABLY
Claim 2
Dependent Claim
69 words
IN AN ULTRAVIOLET LIGHT LAMP HAVING A FUSED QUARTZ GLASS CASING WITH ELECTRODES SEALED THEREIN, THE IMPROVEMENT WHICH COMPRISES SAID FUSED GLASS CASING BEING CONSITUTED OF SUBSTANTIALLY PURE QUARTZ GLASS FREE OF CONDUCTIVE ELEMENTS, CARBON, METALLOIDS, COMPOUNDS CONTAINING SUCH ELEMENTS, HYDROGEN, AND OXIDES OF SILICON WITH A LOWER OXYGEN CONTENT THAN SILICON DIOXIDE IN AMOUNTS CAPABLE OF FORMING CENTERS OF RECRYSTALLIZATION SAID QUARTZ GLASS BEING CHARACTERIZED BY A CONSIDERABLY
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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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |