US3832591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High luminous efficacy white appearing lamp
Assignee: Philips North America LLC
•
Filing: 1973-04-30
•
Granted: 1974-08-27
•
Expires: 1993-04-30
Abstract
Abstract A very efficient white emitting discharge lamp combination. The lamp is similar to a normal high pressure mercury discharge lamp but also contains sodium iodide and thallium iodide as discharge sustaining additives. The lamp also has a phosphor coating of strontium chloroapatite activated by divalent europium on the interior surface of the outer envelope. This combination provides a high intensity source of white light in an extremely efficient manner.
Inventors
- 👤 D Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:20
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/7739; H01J61/12; H01J61/125; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
In combination with a discharge lamp comprising an elongated light-transmitting arc tube enclosing a predetermined volume and containing a predetermined amount of mercury which when fully vaporized during normal operation of said lamp will provide a predetermined pressure of mercury vapor therein, and an outer light-transmitting envelope having an intErior surface spaced from and enclosing said arc tube, the improvement which comprises: a. a phosphor coating substantially comprising strontium chloroapatite activated by divalent europium on said interior surface of said outer envelope; and b. discharge sustaining additives contained in said arc tube, said additives substantially comprising: i. thallium in the amount of about 0.025 to 2.5 mg per cubic centimeter of said arc tube volume; ii. sodium in an amount of about 0.02 to 2.0 mg per cubic centimeter of said arc tube volume; and iii. iodine in an amount which is 70 to 130 percent of the stoichiometric amount required to form TlI and NaI with said amounts of thallium and sodium, whereby said combination provides white light in a very efficient manner.
Claim 2
Dependent Claim
174 words
In combination with a discharge lamp comprising an elongated light-transmitting arc tube enclosing a predetermined volume and containing a predetermined amount of mercury which when fully vaporized during normal operation of said lamp will provide a predetermined pressure of mercury vapor therein, and an outer light-transmitting envelope having an intErior surface spaced from and enclosing said arc tube, the improvement which comprises: a. a phosphor coating substantially comprising strontium chloroapatite activated by divalent europium on said interior surface of said outer envelope; and b. discharge sustaining additives contained in said arc tube, said additives substantially comprising: i. thallium in the amount of about 0.025 to 2.5 mg per cubic centimeter of said arc tube volume; ii. sodium in an amount of about 0.02 to 2.0 mg per cubic centimeter of said arc tube volume; and iii. iodine in an amount which is 70 to 130 percent of the stoichiometric amount required to form TlI and NaI with said amounts of thallium and sodium, whereby said combination provides white light in a very efficient manner.
Claim 3
Dependent Claim
92 words
The combination of claim 1, wherein said thallium is present in the amount of about 0.16-0.33 mg per cubic centimeter of said arc tube volume, said sodium is present in the amount of about 0.215 mg per cubic centimeter of said arc tube volume, said mercury is present in the amount of about 3.33 mg per cubic centimeter of said arc tube volume, and said iodine is present in the amount of about 100 percent of the stoichiometric amount required to form TlI and NaI with said amounts of thallium and sodium.
References Cited (Backward Citations)
US3398312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |