US4548128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fume hood
Assignee: Yamato Scientific Co Ltd
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Filing: 1983-12-28
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Granted: 1985-10-22
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Expires: 2003-12-28
Abstract
Abstract A fume hood forming an experimental work space includes a sensor for detecting an air speed within the exhaust duct. The sensor is provided in a by-pass section which is positioned on the exhaust duct and in communication with the ambient air.
Inventors
- 👤 Tatsumi Morikawa
- 👤 Yoshio Osawa
- 👤 Takao Kawakami
- 👤 Naoki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A fume hood comprising: a hood forming an experimental work space, an exhaust duct for exhausting the air in the workspace, a by-pass section provided on said exhaust duct, said by-pass section being in communication with the ambient air, said by-pass section having a small diameter portion fitted at a right angle to said exhaust duct and a large diameter portion fitted to said small portion, and an air velocity sensor provided in said large portion of said by-pass section, whereby the ratio of said small diameter portion of said by-pass section to said large diameter portion of said by-pass section is such that the velocity of the air in said large diameter portion is suitable to detect the variation of the velocity of the air in said hood.
Claim 2
Dependent Claim
129 words
A fume hood comprising: a hood forming an experimental work space, an exhaust duct for exhausting the air in the workspace, a by-pass section provided on said exhaust duct, said by-pass section being in communication with the ambient air, said by-pass section having a small diameter portion fitted at a right angle to said exhaust duct and a large diameter portion fitted to said small portion, and an air velocity sensor provided in said large portion of said by-pass section, whereby the ratio of said small diameter portion of said by-pass section to said large diameter portion of said by-pass section is such that the velocity of the air in said large diameter portion is suitable to detect the variation of the velocity of the air in said hood.
Claim 3
Dependent Claim
15 words
A fume hood claimed in claim 1, wherein, said velocity sensor is a hot-wire anemometer.
Claim 4
Dependent Claim
46 words
A fume hood claimed in claim 2, wherein, said by-pass section is composed of a fitting section connected to said exhaust duct and a suction section which diameter is larger than the diameter of said fitting section, and said sensor is provided on said suction section.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |