Patent JPS4422981B1 successfully refreshed from Google Patents.
US4363083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw-based incandescent lamp type fluorescent lamp
Assignee: Toshiba Electric Equipment Corp
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Filing: 1980-09-02
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Granted: 1982-12-07
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Expires: 2000-09-02
Abstract
Abstract A screw-based incandescent lamp type fluorescent lamp comprises a luminous tube bent to define a vacant space therein, a ballast for said luminous tube disposed in said vacant space, a holder having an opening facing said ballast at a given distance therefrom and holding said luminous tube and ballast, a basal body supporting said holder, in which upper ventilation slits are formed, and a light transmitting bottomed envelope attached to said basal body to form an outer tube and having a lower ventilation opening with an opening area smaller than the total area of said upper ventilation holes, whereby air introduced from said lower ventilation opening into said bottomed envelope will flow along the outer peripheral surfaces of said ballast and said luminous tube and be discharged from said upper ventilation slits to the outside via the opening of said holder.
Inventors
- 👤 Masashi Tanaka
- 👤 Nobuhiro Fujii
- 👤 Yashuharu Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:01
CPC Classifications
F; F21; F21V; F21V29/00; F21V29/50; F21V29/70; F21V29/83; F21V19/00; F21V19/0075; F21V23/00; F21V23/02; F21Y; F21Y2103/00; F21Y2103/30; F21Y2103/37
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
201 words
A screw-based incandescent lamp type fluorescent lamp comprising: a luminous tube bent to define a vacant space therein; an operating member including a ballast for said tube, the ballast disposed in said vacant space; a holder having an opening facing said ballast at a given distance therefrom and holding said tube and ballast; a base body supporting said holder and having a flange section in which a plurality of upper ventilation holes are formed; a light transmitting bottom envelope having an end edge attached to the peripheral edge of the flange section of said base body and surrounding said tube, at least one lower ventilation opening with an opening area larger than 0.2826 cm 2 and smaller than the total area of said upper ventilation holes being formed in the bottom of said envelope; and a screw base disposed on the top portion of said base body and electrically connected with said tube and said operating member, whereby air introduced from said lower ventilation opening into said light transmitting bottom envelope will flow along the outer peripheral surfaces of said ballast and said tube and be discharged from said upper ventilation holes to the outside via the opening of said holder.
Claim 2
Dependent Claim
201 words
A screw-based incandescent lamp type fluorescent lamp comprising: a luminous tube bent to define a vacant space therein; an operating member including a ballast for said tube, the ballast disposed in said vacant space; a holder having an opening facing said ballast at a given distance therefrom and holding said tube and ballast; a base body supporting said holder and having a flange section in which a plurality of upper ventilation holes are formed; a light transmitting bottom envelope having an end edge attached to the peripheral edge of the flange section of said base body and surrounding said tube, at least one lower ventilation opening with an opening area larger than 0.2826 cm 2 and smaller than the total area of said upper ventilation holes being formed in the bottom of said envelope; and a screw base disposed on the top portion of said base body and electrically connected with said tube and said operating member, whereby air introduced from said lower ventilation opening into said light transmitting bottom envelope will flow along the outer peripheral surfaces of said ballast and said tube and be discharged from said upper ventilation holes to the outside via the opening of said holder.
Claim 3
Dependent Claim
20 words
The fluorescent lamp of claim 1 wherein said total area of said upper ventilation holes is 11.6744 cm 2 .
Claim 4
Dependent Claim
18 words
The fluorescent lamp of claim 2 wherein the diameter of said bottom envelope is less than 12 cm.
Claim 5
Dependent Claim
35 words
The fluorescent lamp of claims 1 or 2 or 3 wherein said opening area of said at least one lower ventilation opening is less than 40% of said total area of said upper ventilation holes.
Claim 6
Dependent Claim
36 words
A fluorescent lamp according to claim 1 or 2 or 3 wherein said lower ventilation opening is a plurality of through holes intensively formed in close vicinity to one another in the bottom of said envelope.
Claim 7
Dependent Claim
43 words
A fluorescent lamp according to claim 5, wherein said plurality of through holes include a first through hole formed in the center of the bottom and second through holes smaller than said first through hole in diameter and surrounding said first through hole.
Claim 8
Dependent Claim
31 words
A fluorescent lamp according to claim 1 or 2 or 3 wherein said lower ventilation opening is a single through hole formed near the center of the bottom of said envelope.
Claim 9
Dependent Claim
60 words
A fluorescent lamp according to claims 1 or 2 or 3, wherein said holder separates the interior of said flange section and the interior of said envelope, said interiors communicating by said opening formed in said holder so that the air introduced from said lower ventilation opening into said envelope may intensively pass through said opening formed in said holder.
Claim 10
Dependent Claim
19 words
A fluorescent lamp according to claim 8, wherein said base body and said envelope form a substantially spherical shape.
References Cited (Backward Citations)
US3953761A
Cited
US4208604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |