US2999216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballast tube
Assignee: Tung Sol Electric Inc
•
Filing: 1960-02-23
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Granted: 1961-09-05
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Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Steiger
- 👤 Yarmovsky Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:48
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875; Y10T428/12937
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A BALLAST TUBE WHICH PASSES CONSTANT CURRENT FOR A RANGE OF APPLIED VOLTAGES COMPRISING, AN ENVELOPE CONTAINING AN IRON WIRE WITH A FIRST COVERING OF NICKEL AND A SECOND COVERING OF PLATINUM, SAID ENVELOPE CONTAINING AN INERT GAS AT REDUCED PRESSURE.
Claim 2
Dependent Claim
41 words
A BALLAST TUBE WHICH PASSES CONSTANT CURRENT FOR A RANGE OF APPLIED VOLTAGES COMPRISING, AN ENVELOPE CONTAINING AN IRON WIRE WITH A FIRST COVERING OF NICKEL AND A SECOND COVERING OF PLATINUM, SAID ENVELOPE CONTAINING AN INERT GAS AT REDUCED PRESSURE.
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) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |