Patent US3021776A successfully refreshed from Google Patents.
US3021776A
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Method and apparatus for ventilating laboratory fume hoods
Assignee: Schneider Electric Buildings Americas Inc
•
Filing: 1958-02-19
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Granted: 1962-02-20
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Expires: 1978-02-19
Abstract
No abstract record available.
Inventors
- 👤 Walter W Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:32
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/023; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US774730A
Cited
GB212152A
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US2119282A
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US2549042A
Cited
CH299644A
Cited
CH313510A
Cited
US2863373A
Cited
US2819666A
Cited
US2794325A
Cited
US2855760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |