US4451816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas monitor
Assignee: Individual
•
Filing: 1981-12-31
•
Granted: 1984-05-29
•
Expires: 2001-12-31
Abstract
Abstract A gas monitor comprises a tape having a layer of gas absorbant material carried by a base. The base and the layer of gas absorbant material are capable of being heated, without being damaged, to a temperature at which any gas absorbed by the gas absorbant material is driven off.
Inventors
- 👤 Geoffrey W. Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
G; G01; G01N; G01N30/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A gas monitor comprising: a tape having a base carrying a layer of gas absorbant material capable of recording magnetic signals, both the base and the layer of gas absorbant material being capable of being heated to a temperature at which any gas absorbed by the gas absorbant material is driven off without being damaged.
Claim 2
Dependent Claim
55 words
A gas monitor comprising: a tape having a base carrying a layer of gas absorbant material capable of recording magnetic signals, both the base and the layer of gas absorbant material being capable of being heated to a temperature at which any gas absorbed by the gas absorbant material is driven off without being damaged.
Claim 3
Dependent Claim
31 words
A gas monitor as claimed in claim 1 which comprises a gas permeable membrane which covers the layer and is capable of being heated to the said temperature without being damaged.
Claim 4
Dependent Claim
66 words
A gas monitor as claimed in claim 2 which comprises a further layer of gas absorbant material carried by the said membrane and a further gas permeable membrane which covers the further layer, the base, both layers and both membranes being capable of being heated to a temperature at which any gas absorbed by either layer of gas permeable material is driven off without being damaged.
Claim 5
Dependent Claim
43 words
A gas monitor as claimed in claim 1 wherein the layer of gas absorbant material covers a central portion of the base and which comprises strips of impermeable material which cover the base on each side of the layer of gas absorbant material.
Claim 6
Dependent Claim
14 words
A gas monitor as claimed in claim 1 wherein the base is of metal.
Claim 7
Dependent Claim
16 words
A gas monitor as claimed in claim 1 wherein the gas monitor material is ferric oxide.
Claim 8
Dependent Claim
53 words
A gas monitor as claimed in claim 1 comprising a housing in which the tape is disposed, the housing having an aperture, and means for driving the tape so that it passes in front of the aperture in which position only the layer of gas absorbant material is exposed to the ambient atmosphere.
Claim 9
Dependent Claim
35 words
A gas monitor as claimed in claim 1 which comprises a housing in which the base and layer of gas absorbant material are held, and a membrane which covers the layer of gas absorbant material.
Claim 10
Dependent Claim
70 words
An analyser for a gas monitor as claimed in claim 1, the analyzer comprising a heater and a gas detector, the gas detector having a gas inlet facing the heater so that the monitor may be disposed between the heater and the inlet and the heater activated whereupon the gases absorbed by the layer of gas absorbant material of the monitor are driven off and enter the gas inlet directly.
References Cited (Backward Citations)
US3603954A
Cited
US3631436A
Cited
US3714562A
Cited
US3924219A
Cited
US3950980A
Cited
US4235097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |