US2663816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge lamp
Assignee: GTE Sylvania Inc
•
Filing: 1949-09-28
•
Granted: 1953-12-22
•
Expires: 1969-09-28
Abstract
No abstract record available.
Inventors
- 👤 Horace H Homer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A DISCHARGE LAMP CATHODE COMPRISING A COILED TUNGSTEN WIRE AND AN ELECTRON-EMITTING MATERIAL HELD BY SAID WIRE AND CONSISTING MAINLY
Claim 2
Dependent Claim
20 words
A DISCHARGE LAMP CATHODE COMPRISING A COILED TUNGSTEN WIRE AND AN ELECTRON-EMITTING MATERIAL HELD BY SAID WIRE AND CONSISTING MAINLY
References Cited (Backward Citations)
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US1925701A
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US1821359A
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US2142331A
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US2233741A
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US2310983A
Cited
US2258158A
Cited
US2457515A
Cited
US2346553A
Cited
US2477279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |