US3930178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical incandescent filament devices
Assignee: EMI Group Ltd
•
Filing: 1974-07-05
•
Granted: 1975-12-30
•
Expires: 1994-07-05
Abstract
Abstract An electrical device with an elongated tubular envelope has an incandescent filament supported along the axis of the envelope by ceramic plates mechanically bonded to the filament and fitting closely in the envelope. The plates may be interconnected by a link rod parallel to the filament which is a single-ended lamp serves also as a lead to one end of the filament.
Inventors
- 👤 James Richard Coaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:19
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18; H01K1/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
In a linear incandescent filament electrical device having an elongated tubular envelope containing a filament extending along the tube parallel to the central axis thereof and supported at intervals by supports which engage the wall of the envelope, the improvement wherein the supports are plates of electricallyinsulating, ceramic material heat-shrunk onto the filament to form a mechanical bond therewith, each plate having edges which fit closely against the inside surface of the envelope and are of sufficient width to prevent skewing of the plate relative to the axis of the envelope.
Claim 2
Dependent Claim
91 words
In a linear incandescent filament electrical device having an elongated tubular envelope containing a filament extending along the tube parallel to the central axis thereof and supported at intervals by supports which engage the wall of the envelope, the improvement wherein the supports are plates of electricallyinsulating, ceramic material heat-shrunk onto the filament to form a mechanical bond therewith, each plate having edges which fit closely against the inside surface of the envelope and are of sufficient width to prevent skewing of the plate relative to the axis of the envelope.
Claim 3
Dependent Claim
31 words
In an electrical device as claimed in claim 1, wherein the improvement further includes at least one link rod extending parallel to the axis of the envelope and interconnecting the plates.
Claim 4
Dependent Claim
30 words
An electrical device as claimed in claim 2, in which each end of the link rod engages with the ends of the envelope to prevent axial movement of the supports.
Claim 5
Dependent Claim
61 words
An electrical device as claimed in claim 2, in which the link rod forms part of an electrical lead which is connected to one end of the filament and extends by way of the link rod to the opposite end of the filament, and passes through the same end of the envelope as a lead connected to the said opposite end.
Claim 6
Dependent Claim
22 words
An electrical device as claimed in claim 4, in which the electrically-conductive link rod is provided with an insulating coating or sheath.
References Cited (Backward Citations)
US1997975A
Cited
US2813993A
Cited
US2901658A
Cited
US2910605A
Cited
US2980820A
Cited
US3195001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |