Patent US2701998A successfully refreshed from Google Patents.
US2701998A
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Ventilating apparatus
Assignee: Pyle National Co
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Filing: 1952-03-26
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Granted: 1955-02-15
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Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 William A Wulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068; F24D; F24D3/00; F24D3/12; F24D3/122; F24D3/127; F24D3/16; F24D3/165; Y; Y02; Y02B; Y02B30/00; Y10; Y10S; Y10S454/00; Y10S454/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE114647C
Cited
GB375862A
Cited
US2172771A
Cited
US2180945A
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US2221001A
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US2251682A
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US2203590A
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GB601239A
Cited
US2550810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |