US3706895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp having coated inleads
Assignee: General Electric Co
•
Filing: 1971-02-17
•
Granted: 1972-12-19
•
Expires: 1991-02-17
Abstract
Abstract A fluorescent lamp in which the inleads or clamps of the electrodes are coated with a high temperature plastic containing a filler of an insulating inorganic material. The plastic is not removed by baking but remains in place in the completed lamp. One suitable material consists of an aromatic polyimide wherein the filler is zirconium oxide. The coating eliminates or lessens light-absorbing oxide rings and brown patches which form on the envelope ends as a result of the arc taking off from the inleads instead of from the electrode coil, a condition to which instant start lamps are particularly prone.
Inventors
- 👤 William C Martyny
- 👤 Victor W Miller
- 👤 Ronald J Olwert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
14 words
A lamp as in claim 1 wherein the polymeric plastic is an aromatic polyimide.
Claim 2
Dependent Claim
24 words
A lamp as in claim 1 wherein the polymeric plastic is an aromatic polyimide characterized by a recurring unit having the following structural formula:
Claim 3
Dependent Claim
20 words
A lamp as in claim 1 wherein the polymeric plastic is the polyimide of pyromellitic dianhydride and 4,4''-diamino diphenyl ether.
Claim 4
Dependent Claim
24 words
A lamp as in claim 1 wherein the polymeric plastic is an aromatic polyimide characterized by a recurring unit having the following structural formula:
Claim 5
Dependent Claim
34 words
A lamp as in claim 1 wherein the polymeric plastic is the polyimide of pyromellitic dianhydride and 4,4''-diamino diphenyl ether and wherein the inorganic filler is zirconium oxide, or aluminum oxide or magnesium oxide.
Claim 6
Dependent Claim
45 words
A lamp as in claim 1 wherein the polymeric plastic is the polyimide of pyromellitic dianhydride and 4,4''-diamino diphenyl ether and wherein the inorganic filler is zirconium oxide provided in a ratio of 100 to 500 grams of filler to 100 milliliters of polyimide-forming varnish.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |