Patent US3767366A successfully refreshed from Google Patents.
US3767366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooled oxygen producing unit
Assignee: MSA Safety Inc
•
Filing: 1971-09-21
•
Granted: 1973-10-23
•
Expires: 1991-09-21
Abstract
Abstract An oxygen producing candle is surrounded by a metal shell, which in turn is enclosed in a metal housing spaced from the shell. The unit is provided with an oxygen passage connecting the inside of the shell with the outside of the unit for delivery of oxygen therefrom. The space between the shell and housing is filled with absorbent insulation, in which water-filled tubes are embedded around the shell. The ends of these tubes are sealed by means that will be destroyed when heat from the burning candle raises the temperature of the tubes to a predetermined point. The water thereby released from the tubes will vaporize and escape through a vent in the housing in order to remove heat from the unit.
Inventors
- 👤 C Staub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:12
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0296; A; A62; A62B; A62B21/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
An oxygen unit according to claim 1, in which portions of said tubes engage said shell.
Claim 2
Dependent Claim
22 words
An oxygen unit according to claim 1, in which said tubes extend lengthwise of the shell and are spaced circumferentially around it.
Claim 3
Dependent Claim
20 words
An oxygen unit according to claim 1, in which said tubes encircle the shell and are spaced axially along it.
Claim 4
Dependent Claim
36 words
An oxygen unit according to claim 1, including a container for the candle provided with an outlet port at said one end of the candle, and a layer of thermal insulation between said container and shell.
Claim 5
Dependent Claim
18 words
An oxygen unit according to claim 1, including a layer of insulation engaging the candle inside said shell.
Claim 6
Dependent Claim
49 words
An oxygen unit according to claim 1, including a layer of insulation engaging the candle inside said shell, said oxygen passage including a conduit extending from the shell through said housing, and said unit having filtering means between the inner end of said conduit and said layer of insulation.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |