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US3274420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular fluorescent lamps
Assignee: Toshiba Corp
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Filing: 1961-09-27
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Granted: 1966-09-20
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Expires: 1981-09-27
Abstract
No abstract record available.
Inventors
- 👤 Kameyama Akira
- 👤 Funabashi Tetsuo
- 👤 Kusakawa Ichiro
- 👤 Watanabe Jiro
- 👤 Hayao Takashi
- 👤 Takashima Yoshihisa
- 👤 Maruyama Nisaburo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:21
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/56; H01J5/565
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
AN ANNULAR FLUORESCENT LAMP COMPRISING A GLASS TUBE OF CIRCULAR FORM WITH THE OPPOSITE ENDS DISPOSED IN OPPOSED RELATION: NODAL GRIPPING FORMATIONS COMPRISING A CIRCUMFERENTIAL RIDGE ON SAID TUBE AT THE OPPOSITE ENDS THEREOF; SAID TUBE HAVING ON ITS INSIDE A FLUORESCENT LAYER COATED PRIOR TO THE BENDING OF THE TUBE; AND, A ONE PIECE LIGHT TRANSMITTING BASE MEANS SNAPPED ONTO THE OPPOSITE TUBE ENDS.
Claim 2
Dependent Claim
65 words
AN ANNULAR FLUORESCENT LAMP COMPRISING A GLASS TUBE OF CIRCULAR FORM WITH THE OPPOSITE ENDS DISPOSED IN OPPOSED RELATION: NODAL GRIPPING FORMATIONS COMPRISING A CIRCUMFERENTIAL RIDGE ON SAID TUBE AT THE OPPOSITE ENDS THEREOF; SAID TUBE HAVING ON ITS INSIDE A FLUORESCENT LAYER COATED PRIOR TO THE BENDING OF THE TUBE; AND, A ONE PIECE LIGHT TRANSMITTING BASE MEANS SNAPPED ONTO THE OPPOSITE TUBE ENDS.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |