Patent US3821576A successfully refreshed from Google Patents.
US3821576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure mercury titanium iodine discharge lamp with phosphor coating
Assignee: Philips North America LLC
•
Filing: 1973-04-02
•
Granted: 1974-06-28
•
Expires: 1993-04-02
Abstract
Abstract A high-efficiency, high-intensity blue-emitting discharge lamp combination in which, to the normal arc tube containing a predetermined amount of mercury and the normal outer envelope, there is added a phosphor coating of strontium chloro-apatite activated by divalent europium onto the interior surface of the outer envelope and there is also added titanium and iodine as discharge sustaining additives in the arc tubes. This combination provides a substantially more efficient high-intensity source of blue light than previous sources and is especially useful in the medical and photocopying fields.
Inventors
- 👤 D Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:57
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
The combination of claim 1, wherein said titanium is present in the amount of about 0.13 mg per cc of said arc tube volume, said mercury is present in the amount of about 2.5 mg per cc of said arc tube volume, and said iodine is present in the amount of about 0.074 mg per cc of said arc tube volume.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |