Patent US2828683A successfully refreshed from Google Patents.
US2828683A
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Ventilating apparatus
Assignee: Individual
•
Filing: 1955-04-11
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Granted: 1958-04-01
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Anthony B Joseph
- 👤 Stanley M Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:09
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; F24F; F24F13/00; F24F13/20; F24F8/00; F24F8/10; F24F8/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2112277A
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US2226641A
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US2296635A
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US2483547A
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US2464473A
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US2528844A
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US2487607A
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US2621755A
Cited
US2619021A
Cited
US2596874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |