US4334940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making solid electrolyte oxygen sensor with integral heater
Assignee: Bank of Nova Scotia
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Filing: 1980-11-17
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Granted: 1982-06-15
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Expires: 2000-11-17
Abstract
Abstract Solid electrolyte oxygen sensor incorporates a sealed integral heater which is positioned internally of the tubular wall of the ceramic sensor body in the region radially adjacent the disc shaped solid electrolyte which is mounted transverse to the axis of the body. A plurality of small longitudinal apertures are formed in the body wall by extrusion. A groove formed in the external side wall of the body provides access so that a resistance heating wire can be threaded alternately in opposite directions through the small apertures. The wire bends are accommodated by the side wall groove and an end wall groove, each of which can be sealed with a castable ceramic after the wire is installed.
Inventors
- 👤 Edward P. Habdas
- 👤 Jon D. Aaron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:53
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4067; C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/50; C04B2237/62; C04B2237/76; C04B2237/765
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A method of sealing a disc of solid electrolyte in the sensing end of a tubular ceramic oxygen sensor body comprising the steps of forming a recess in the end of the tube, applying a glass frit paste to the bottom and side surfaces of the recess, heating the tube to evaporate the solvent and leave a caked fillet of glass powder, inserting the disc against the glass powder, turning the assembly upside down and placing it on a support so that the disc rests on the support while the weight of the tube is supported solely by the disc, and firing the supported assembly to melt the glass and seal the disc to the tubular body.
Claim 2
Independent Claim
117 words
A method of sealing a disc of solid electrolyte in the sensing end of a tubular ceramic oxygen sensor body comprising the steps of forming a recess in the end of the tube, applying a glass frit paste to the bottom and side surfaces of the recess, heating the tube to evaporate the solvent and leave a caked fillet of glass powder, inserting the disc against the glass powder, turning the assembly upside down and placing it on a support so that the disc rests on the support while the weight of the tube is supported solely by the disc, and firing the supported assembly to melt the glass and seal the disc to the tubular body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |