US3679385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of interior coated bulbs for high temperature glass lamps
Assignee: General Electric Co
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Filing: 1970-09-18
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Granted: 1972-07-25
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Expires: 1990-09-18
Abstract
Abstract AN INTERIOR COATED LAMP ENVELOPE HAVING A THICK-WALLED BULBOUS PORTION IS MANUFACTURED BY FIRST COATING AN INTERIOR REGION OF A LENGTH OF QUARTZ TUBING WITH A LAYER OF BORIC OXIDE. THIS MAY BE DONE BY BUBBLING NITROGEN GAS THROUGH LIQUID TRIMETHYL BORATE AND FEEDING THE RESULTANT VAPORS, ALONG WITH AIR, THROUGH THE QUARTZ TUBING WHILE ROTATING IN A GLASS LATHE AND HEATING THE REGION THEREOF WHICH IS TO BE FORMED INTO A THICK-WALLED BULBOUS PORTION. WHILE CONTINUING THE HEATING, THE ENDS OF THE TUBING ARE FORCED TOWARD EACH OTHER THEREBY FORMING A THICK-WALLED BULBOUS PORTION AND AT THE SAME TIME BAKING THE DEPOSITED COATING OF BORIC OXIDE.
Inventors
- 👤 Stephen P Senft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:18
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/049; C03B23/0493; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/228; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/152; C03C2218/30; C03C2218/32; Y; Y10; Y10S; Y10S65/00; Y10S65/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |