GB2413891B - Lamp tube having a uniform lighting profile and a manufacturing method therefor - Google Patents

Lamp tube having a uniform lighting profile and a manufacturing method therefor

Info

Publication number
GB2413891B
GB2413891B GB0512658A GB0512658A GB2413891B GB 2413891 B GB2413891 B GB 2413891B GB 0512658 A GB0512658 A GB 0512658A GB 0512658 A GB0512658 A GB 0512658A GB 2413891 B GB2413891 B GB 2413891B
Authority
GB
United Kingdom
Prior art keywords
manufacturing
lamp tube
method therefor
uniform lighting
lighting profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB0512658A
Other versions
GB2413891A (en
GB0512658D0 (en
Inventor
Kurt Eugene Spears
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/938,033 external-priority patent/US6747403B2/en
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of GB0512658D0 publication Critical patent/GB0512658D0/en
Publication of GB2413891A publication Critical patent/GB2413891A/en
Application granted granted Critical
Publication of GB2413891B publication Critical patent/GB2413891B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H01J61/44—Devices characterised by the luminescent material
GB0512658A 2001-08-22 2002-08-15 Lamp tube having a uniform lighting profile and a manufacturing method therefor Expired - Fee Related GB2413891B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/938,033 US6747403B2 (en) 2001-08-22 2001-08-22 Lamp tube having a uniform lighting profile and a manufacturing method therefor
GB0219050A GB2383894B (en) 2001-08-22 2002-08-15 Lamp tube having a uniform lighting profile and a manufacturing method therefor

Publications (3)

Publication Number Publication Date
GB0512658D0 GB0512658D0 (en) 2005-07-27
GB2413891A GB2413891A (en) 2005-11-09
GB2413891B true GB2413891B (en) 2006-02-01

Family

ID=35115807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0512658A Expired - Fee Related GB2413891B (en) 2001-08-22 2002-08-15 Lamp tube having a uniform lighting profile and a manufacturing method therefor

Country Status (1)

Country Link
GB (1) GB2413891B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162252A (en) * 1981-03-30 1982-10-06 Nec Home Electronics Ltd Fluorescent lamp
JPS59219831A (en) * 1983-05-30 1984-12-11 Matsushita Electric Works Ltd Method for coating phosphor
JPS62285357A (en) * 1986-06-04 1987-12-11 Hitachi Ltd Fluorescent lamp
US5998921A (en) * 1997-03-21 1999-12-07 Stanley Electric Co., Ltd. Fluorescent lamp with coil shaped internal electrode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162252A (en) * 1981-03-30 1982-10-06 Nec Home Electronics Ltd Fluorescent lamp
JPS59219831A (en) * 1983-05-30 1984-12-11 Matsushita Electric Works Ltd Method for coating phosphor
JPS62285357A (en) * 1986-06-04 1987-12-11 Hitachi Ltd Fluorescent lamp
US5998921A (en) * 1997-03-21 1999-12-07 Stanley Electric Co., Ltd. Fluorescent lamp with coil shaped internal electrode

Also Published As

Publication number Publication date
GB2413891A (en) 2005-11-09
GB0512658D0 (en) 2005-07-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20080815