US3833398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of providing an adherent phosphor coating on a fluorescent lamp
Assignee: GTE Sylvania Inc
•
Filing: 1973-05-03
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Granted: 1974-09-03
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Expires: 1993-05-03
Abstract
Abstract In a method of coating fluorescent lamp glass envelopes to provide improved adhesion of phosphor and alumina particles, conditioning the phosphor and aluminium oxide particles in a solution of ammonium lignosulfonate, removing the particles from the solution, washing, providing an aqueous suspension containing the conditioned particles and an organic binder and applying the particles to the glass envelope to provide a coating.
Inventors
- 👤 W Schreurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:38
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/006; C03C17/008; C03C17/009; C03C17/007; C09; C09K; C09K11/00; C09K11/02; C03C2217/00; C03C2217/40; C03C2217/43; C03C2217/44; C03C2217/45; C03C2217/46; C03C2217/47; C03C2217/475
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
25 words
The method of claim 1 wherein the weight ratio of the aluminum oxide particles to the phosphor particles is between about 0.2 and 2.0 percent.
Claim 2
Dependent Claim
21 words
The method of claim 1 wherein the weight ratio of ammonium lignosulfonate to phosphor is between about 0.02 and 0.2 percent.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the weight ratio of polyoxyethylene to phosphor in the coating suspension is between about 0.5 and 5.0 percent.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |