Patent US2553866A successfully refreshed from Google Patents.
US2553866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake ventilating hood
Assignee: ELECTRO SPECIALTY Manufacturing CO Inc
•
Filing: 1947-04-30
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Granted: 1951-05-22
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Expires: 1967-04-30
Abstract
No abstract record available.
Inventors
- 👤 Carl W Olson
- 👤 Willard A Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US607976A
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US942801A
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DE444228C
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US2091019A
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US2204401A
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US2182106A
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US2237831A
Cited
US2226641A
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US2243491A
Cited
US2323055A
Cited
US2495376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |