US3984589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a low pressure mercury vapor discharge lamp
Assignee: US Philips Corp
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Filing: 1974-10-21
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Granted: 1976-10-05
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Expires: 1994-10-21
Abstract
Abstract In a low-pressure mercury vapor discharge lamp a method of applying a tin oxide coating to the inside wall of the lamp having a resistance per square of more than 10,000 Ohm to avoid blackening of the glass. This coating may be used in the aperture of a lamp for photo-copying purposes.
Inventors
- 👤 Rein Willemse VAN DER Wolfe
- 👤 Thomas Hendrik DE Vette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/30; H01J61/35; H01J61/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
A method of coating the inner side of the glass envelope of a low-pressure mercury vapour discharge lamp which comprises: forming on the inside surface of said envelope a tin oxide coating having a resistance greater than 10,000 ohms per square in situ from an organic tin compound.
Claim 2
Independent Claim
48 words
A method of coating the inner side of the glass envelope of a low-pressure mercury vapour discharge lamp which comprises: forming on the inside surface of said envelope a tin oxide coating having a resistance greater than 10,000 ohms per square in situ from an organic tin compound.
Claim 3
Dependent Claim
30 words
A method as claimed in claim 1, which comprises applying to the inner surface of said glass envelope a non-sintered, binder-containing light reflective coating before forming said tin oxide coating.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1, characterized in that the organic tin compound consists of dibutyltinmaleate.
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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |