US3840766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash tube with reduced rf noise
Assignee: GTE Sylvania Inc
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Filing: 1973-12-13
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Granted: 1974-10-08
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Expires: 1993-12-13
Abstract
Abstract A xenon flash tube having a glass envelope with anode and cathode electrodes sealed in respective ends thereof. A barium dispenser is attached to each electrode, and a flashed barium deposit is located on the inside surface of each end of the envelope so as not to mask the arc discharge. The total quantity of barium in the envelope is selected to controllably reduce the radio frequency noise emitted from the flash tube during operation.
Inventors
- 👤 J Pappas
- 👤 R Cosco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:36
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/80; H01J61/02; H01J61/24; H01J61/26; H01J61/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A flash tube comprising: an hermetically sealed light transmitting envelope; a rare gas in said envelope; a pair of electrodes in said envelope between which an arc discharge path is defined during operation of said lamp; and a flashed barium deposit on portions of the inside surface of said envelope, said flashed barium deposit being located to substantially avoid masking said arc discharge path, and the total quantity of said barium in the flash tube being selected to controllably reduce the radio frequency noise emitted from said flash tube during operation.
Claim 2
Dependent Claim
91 words
A flash tube comprising: an hermetically sealed light transmitting envelope; a rare gas in said envelope; a pair of electrodes in said envelope between which an arc discharge path is defined during operation of said lamp; and a flashed barium deposit on portions of the inside surface of said envelope, said flashed barium deposit being located to substantially avoid masking said arc discharge path, and the total quantity of said barium in the flash tube being selected to controllably reduce the radio frequency noise emitted from said flash tube during operation.
Claim 3
Dependent Claim
29 words
A flash tube according to claim 1 wherein the quantity of barium in said envelope is substantially greater than the quantity of barium getter required for minimum starting voltage.
Claim 4
Dependent Claim
15 words
A flash tube according to claim 1 further including means for providing external triggering thereof.
Claim 5
Dependent Claim
13 words
A flash tube according to claim 1 wherein said rare gas is xenon.
Claim 6
Dependent Claim
15 words
A flash tube according to claim 4 wherein said envelope is formed of glass tubing.
Claim 7
Dependent Claim
32 words
A flash tube according to claim 1 wherein said electrodes are disposed with one at each end of said envelope, and further including barium dispensing means attached to each of said electrodes.
Claim 8
Dependent Claim
63 words
A flash tube according to claim 6 wherein one of said electrodes comprises the cathode and the other electrode comprises the anode, and said barium dispensing means are attached to said electrodes in a manner whereby said flashed barium deposit is located on the inside surface of each end of said envelope in a manner which substantially avoids masking said arc discharge path.
Claim 9
Dependent Claim
49 words
A flash tube according to claim 6 further including an external trigger wire wrapped about the exterior of said envelope, and wherein said flashed barium deposit is located on the inside surface of each end of said envelope in a manner which substantially avoids masking said arc discharge path.
Claim 10
Dependent Claim
22 words
A flash tube according to claim 8 wherein said envelope comprises a helically shaped piece of glass tubing sealed at both ends.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |