Patent US3715612A successfully refreshed from Google Patents.
US3715612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure mercury vapor discharge lamp radiating germicidal and erythemal rays in ratio of less than 1.5
Assignee: Toshiba Corp
•
Filing: 1971-06-03
•
Granted: 1973-02-06
•
Expires: 1991-06-03
Abstract
Abstract A low pressure mercury vapor discharge lamp emitting erythemal rays and germicidal rays includes an envelope on the inner surface of which there is coated with an erythemal ray emitting film for transmitting to the outside of said envelope visible straight light beams within the range of 45 to 75 percent.
Inventors
- 👤 A Someya
- 👤 K Kohmoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:32
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A low pressure mercury vapor discharge lamp radiating germicidal and erythemal rays in the ratio of less than 1.5, comprising: an envelope made of germicidal ray transmissible glass, said envelope having a transmissivity to ultraviolet rays of more than about 70 percent and to mercury resonant lines generating health injuring ozone of less than about 20 percent; mercury and rare gas filled in said envelope; a pair of electrodes sealed to both ends thereof; and a fluorescent layer formed of at least one material selected from the group consisting of calcium zinc phosphate and lead activated calcium silicate, deposited on the inner surface of said envelope, said envelope and deposited fluorescent layer having a transmissivity of 45 to 75 percent of visible straight light beams.
Claim 2
Dependent Claim
125 words
A low pressure mercury vapor discharge lamp radiating germicidal and erythemal rays in the ratio of less than 1.5, comprising: an envelope made of germicidal ray transmissible glass, said envelope having a transmissivity to ultraviolet rays of more than about 70 percent and to mercury resonant lines generating health injuring ozone of less than about 20 percent; mercury and rare gas filled in said envelope; a pair of electrodes sealed to both ends thereof; and a fluorescent layer formed of at least one material selected from the group consisting of calcium zinc phosphate and lead activated calcium silicate, deposited on the inner surface of said envelope, said envelope and deposited fluorescent layer having a transmissivity of 45 to 75 percent of visible straight light beams.
References Cited (Backward Citations)
US2355258A
Cited
US2362384A
Cited
US2362385A
Cited
US2447210A
Cited
US2424454A
Cited
US2445692A
Cited
US3150281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |