US5092227B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the ventilation of laboratory fume hoods
Assignee: Siemens Industry Inc
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Filing: 1990-09-28
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Granted: 1995-02-14
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Expires: 2010-09-28
Abstract
No abstract record available.
Inventors
- 👤 Osman Ahmed
- 👤 Steven A Bradley
- 👤 Steven L Fritsche
- 👤 Steven D Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:58
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/023; F; F24; F24F; F24F3/00; F24F3/12; F24F3/16; F24F3/163; G; G05; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0629; G05D7/0635; G05D7/0641; G05D7/0652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |