Patent US3628028A successfully refreshed from Google Patents.
US3628028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window cleaning apparatus for photometric instruments
Assignee: Honeywell Inc
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Filing: 1968-03-01
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Granted: 1971-12-14
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Expires: 1988-03-01
Abstract
Abstract An apparatus for use in photometric instruments is described in which conditioning of the gaseous sample under study is unnecessary. No filters, condensers, sample heaters, vapor traps or detector heaters are used. A curtain of clean air over the radiation source and radiation detector windows protects them from condensate or particulate matter in the sample and provides a fixed radiation path length.
Inventors
- 👤 Joseph O Thorsheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:59
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N21/01; G01N21/15; G02; G02B; G02B27/00; G02B27/0006; G01N2021/151
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
Apparatus for photometric instruments comprising, wall means defining a space through which a fluid sample may flow, a window in said wall, means for admitting an inert gas through said wall means upstream of said window with respect to sample flow, conduit means extending along said wall means between said inert gas source and said window and confining gas flow to a thin area along said wall means and discharging inert gas in thin laminar flow over said window, the flow continuing substantially parallel to said wall means to a point beyond said window downstream of sample flow.
Claim 2
Dependent Claim
98 words
Apparatus for photometric instruments comprising, wall means defining a space through which a fluid sample may flow, a window in said wall, means for admitting an inert gas through said wall means upstream of said window with respect to sample flow, conduit means extending along said wall means between said inert gas source and said window and confining gas flow to a thin area along said wall means and discharging inert gas in thin laminar flow over said window, the flow continuing substantially parallel to said wall means to a point beyond said window downstream of sample flow.
Claim 3
Dependent Claim
35 words
Apparatus according to claim 1 in which said wall means has two windows in the wall means together with a radiation source associated with one window and a radiation sensor associated with the other window.
Claim 4
Dependent Claim
28 words
Apparatus according to claim 2 in which said wall means has two parallel spaced wall surfaces with said two windows oppositely disposed therein across the sample flow space.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |