Patent US3538370A successfully refreshed from Google Patents.
US3538370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straight type fluorescent lamp having improved light output and exhibiting reduced blackening
Assignee: Toshiba Corp
•
Filing: 1968-08-27
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Granted: 1970-11-03
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 Tsunekazu Hashimoto
- 👤 Akira Someya
- 👤 Teizo Hanada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:14
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0672; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2991386A
Cited
US3462631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |