US5046854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photometric cell and probe having windows fusion sealed to a metallic body
Assignee: Dow Chemical Co
•
Filing: 1991-01-24
•
Granted: 1991-09-10
•
Expires: 2011-01-24
Abstract
Abstract A photometric probe or a photometric cell having separate windows and a metallic probe body or cell body. The window(s) are sealed to the probe or cell body by brazed or frit seals which are less likely to leak after extended use in high temperature and/or high pressure industrial applications than probes and cells having gasket sealed windows. The windows can be made of sapphire, cubic zirconia, diamond, ruby, glass or quartz and, in the case of the probe, can be in the shape of an Attenuated Total Reflectance prism. The probe or cell body can be Kovar alloy or stainless steel.
Inventors
- 👤 Joseph P. Weller
- 👤 David P. Denton
- 👤 Sandra V. Lange
- 👤 Chester R. Norman
- 👤 Mary A. Leugers
- 👤 Stuart Farquharson
- 👤 Jean P. Chauvel, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:24
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/84; G01N21/85; G01N21/8507; G01N21/0317
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
A non-leaking photometric cell suitable for high temperature and/or high pressure industrial applications, comprising: a first window; a second window; a first metallic tube; a second metallic tube; a metallic body defining a cavity therein, the metallic body having at least a first aperture and a second aperture thereinto each in communication with the cavity, the first window positioned entirely in the cavity and near an end of the first metallic tube, the first metallic tube being positioned through and removably sealed to the first aperture, the second window positioned entirely in the cavity and near an end of the second metallic tube, the second metallic tube being positioned through and removably sealed to the second aperture; a first continuous brazed seal between the first metallic tube and the first window; and a second continuous brazed seal between the second metallic tube and the second window, so that light can be passed through the first window into a sample positioned between the two windows in the cavity and then through the second window to a photodetector essentially without any of the sample leaking between the first window and the metallic body or between the second window and the metallic body.
Claim 2
Dependent Claim
200 words
A non-leaking photometric cell suitable for high temperature and/or high pressure industrial applications, comprising: a first window; a second window; a first metallic tube; a second metallic tube; a metallic body defining a cavity therein, the metallic body having at least a first aperture and a second aperture thereinto each in communication with the cavity, the first window positioned entirely in the cavity and near an end of the first metallic tube, the first metallic tube being positioned through and removably sealed to the first aperture, the second window positioned entirely in the cavity and near an end of the second metallic tube, the second metallic tube being positioned through and removably sealed to the second aperture; a first continuous brazed seal between the first metallic tube and the first window; and a second continuous brazed seal between the second metallic tube and the second window, so that light can be passed through the first window into a sample positioned between the two windows in the cavity and then through the second window to a photodetector essentially without any of the sample leaking between the first window and the metallic body or between the second window and the metallic body.
Claim 3
Dependent Claim
29 words
The cell of claim 1 wherein at least one of the windows comprises a material selected from the group consisting of sapphire, cubic zirconia, diamond, ruby, glass and quartz.
References Cited (Backward Citations)
US2964640A
Cited
US3281174A
Cited
US3177706A
Cited
US3289291A
Cited
US3263025A
Cited
US3415556A
Cited
US3323821A
Cited
US3281523A
Cited
US3394451A
Cited
US3555450A
Cited
US3736650A
Cited
US3969126A
Cited
US3886364A
Cited
US4064826A
Cited
US4063803A
Cited
US4179037A
Cited
US4188126A
Cited
US4355321A
Cited
US4682846A
Cited
US4577110A
Cited
US4614428A
Cited
US4707134A
Cited
US4666251A
Cited
EP0206433A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |