US4077776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas and gas-carried suspended matter indicator tube having fixing elements for reagent carriers
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1977-06-01
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Granted: 1978-03-07
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Expires: 1997-06-01
Abstract
Abstract The gas or gas-carried suspended matter indicator tube includes a reagent therein for detecting gases or suspended matter in the gas which are passed through the tube. The tube is drawn down at each end and sealed. Each end of the tube or the portion of the tube at which the reagent ends, is retained by fixing elements, which comprise glass granules which are sintered.
Inventors
- 👤 Hans Moller
- 👤 Bernd Mussmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:44
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
An indicator tube, comprising a glass tube having a reagent carrier therein for indicating a gas or a suspension in a gas and a fixing element for the reagent carrier comprising sintered glass granules.
Claim 2
Dependent Claim
34 words
An indicator tube, comprising a glass tube having a reagent carrier therein for indicating a gas or a suspension in a gas and a fixing element for the reagent carrier comprising sintered glass granules.
Claim 3
Dependent Claim
37 words
An indicator tube, as claimed in claim 1, wherein said tube has an end drawn down to a tip and closed, said glass granules being arranged adjacent said tip and separating the reagent carrier from the tip.
Claim 4
Dependent Claim
40 words
An indicator tube, as claimed in claim 1, wherein said tube includes a tip formation adjacent one end and is closed at said one end, said granules being in the tube adjacent said end and being sintered in position therein.
Claim 5
Dependent Claim
29 words
An indicator tube, as claimed in claim 1, wherein said sintered glass granules are arranged in the form of a ball fitting the inside diameter of said glass tube.
Claim 6
Dependent Claim
29 words
An indicator tube, as claimed in claim 1, wherein said sintered glass granules are arranged in the form of a cylinder fitting the inside diameter of said glass tube.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |