Patent US2973447A successfully refreshed from Google Patents.
US2973447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grooved lamp vapor pressure control
Assignee: General Electric Co
•
Filing: 1958-05-12
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Granted: 1961-02-28
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Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 John O Aicher
- 👤 Lemmers Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:22
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2213245A
Cited
US2317265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |