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Patent US2720825A successfully refreshed from Google Patents.
US2720825A
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Jet-type enclosure ventilator
Assignee: HARRY E PONTIUS
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Filing: 1952-11-05
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Granted: 1955-10-18
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Expires: 1972-11-05
Abstract
No abstract record available.
Inventors
- 👤 William A Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:06
CPC Classifications
F; F23; F23L; F23L17/00; F23L17/02; F23L17/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US67471A
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US328818A
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GB189719266A
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US718186A
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US1686871A
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AU45936A
Cited
US2142724A
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US2242310A
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US2357705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |