Patent US3780328A successfully refreshed from Google Patents.
US3780328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting unit for use underwater and in wet environment
Assignee: Electronic Control & Surveilla
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Filing: 1971-12-30
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Granted: 1973-12-18
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Expires: 1991-12-30
Abstract
Abstract An underwater lighting unit comprises a low voltage tungstenhalogen lamp within an outer envelope of borosilicate glass, with an evacuated cavity between the two. The envelope is designed to withstand 8,000 p.s.i. in water. Connections are made onto metal pins sheathed in glass sleeves or protrusions integral with the envelope. The pins are inserted into receptacles embedded in an insulating core within a shell of a free flooding lampholder. Rubber sleeves on the pins are compressed into spaces between the sleeves and the bottoms of recesses in the glass core. There are spring contact clips between the pins and bores in the pin receptacles.
Inventors
- 👤 M Sewell
- 👤 M Boddy
- 👤 G Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:52
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/34; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
The lighting unit according to claim 1, wherein the low voltage lamp has an operating voltage of 24 volts A.C. or D.C., a power rating of 70 watts and a light output of 1,750 lumens.
Claim 2
Dependent Claim
17 words
The lighting unit according to claim 1, wherein the low voltage lamp consists of a tungsten-iodine lamp.
Claim 3
Dependent Claim
31 words
The lighting unit according to claim 1, wherein the borosilicate glass is one having the following formula: silica 81 percent; soda 5 percent; boric acid 12 percent; and alumina 2 percent.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |