Method of manufacturing lamp with filament support structure
Abstract
Abstract A WIRE SUPPORT FOR THE FILAMENT OF A TUBULAR INCANDESCENT LAMP HAVING A PINCH SEAL IN WHICH THE WIRE SUPPORT IS FORMED WITH TWO TRANSVERSELY HELICAL SECTIONS OF SEVERAL TURNS EACH WITH THE SECTIONS HAVING DIFFERENT DIAMETERS, THE ONE OF SMALLER DIAMETER RECEIVING THE FILAMENT AND THE ONE OF LARGER DIAMETER ENGAGING THE INNER WALL OF THE ENVELOPE, THE SUPPORT BEING PROVIDED WITH A LONGITUDINAL TAIL SECTION SEALED IN THE PRESS. IN ASSEMBLY, THE HELICAL SECTION OF LARGER DIAMETER IS TWISTED TO REDUCE ITS DIAMETER TO ENABLE PASSING THE ENVELOPE OVER THE WIRE SUPPORT TO A PREDETERMINED LOCATION WITHIN THE ENVELOPE. THE FILAMENT MOUNT, LEAD-IN CONDUCTORS AND FILAMENT ARE NEXT PASSED THROUGH THE SUPPORT AND POSITIONED FOR SUBSEQUENT PINCH SEALING.
Inventors
- 👤 B Shanks
Bibliographic Details
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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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |