| (19) |
 |
|
(11) |
EP 0 962 691 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
25.10.2000 Bulletin 2000/43 |
| (43) |
Date of publication A2: |
|
08.12.1999 Bulletin 1999/49 |
| (22) |
Date of filing: 28.05.1999 |
|
| (51) |
International Patent Classification (IPC)7: F21H 1/02 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
06.06.1998 GB 9812110
|
| (71) |
Applicant: Levelrecall Limited |
|
Bubbenhall, Warwickshire CV8 3BT (GB) |
|
| (72) |
Inventors: |
|
- Darmanin, Rosemarie
Zabbar ZBR 04 (MT)
- Borg, Adrian M.
B'kara BKR 06 (MT)
|
| (74) |
Representative: Pearce, Anthony Richmond |
|
MARKS & CLERK, Alpha Tower, Suffolk Street Queensway
Birmingham B1 1TT
Birmingham B1 1TT (GB) |
|
| |
|
| (54) |
Yttrium oxide based gas mantle |
(57) The present invention relates to incandescent pre-formed low-pressure gas mantles
useful for fixed fuel-burning lanterns, such as stationary lamp posts or patio lights
(typically at gas pressures of 2.7KPa). The pre-formed low-pressure gas mantle has
a body comprising: (A) 77.1 to 85.3 mol% yttrium oxide as the predominant metal oxide,
(B) 1.4 to 3.1 mol% of at least one lanthanide oxide, (C) 2.2 to 5.0 mol% of at least
one of magnesium oxide and aluminium oxide, and (D) 11.1 to 14.8 mol% of calcium oxide,
based on the total molar content of (A), (B), (C) and (D). Such a mantle is non-radioactive,
durable and provides good illumination.