Patent US2767906A successfully refreshed from Google Patents.
US2767906A
Expired / Lapsed
US
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Centrifugal fan wheel
Assignee: Doyle Vacuum Cleaner Co
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Filing: 1952-11-07
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Granted: 1956-10-23
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Expires: 1972-11-07
Abstract
No abstract record available.
Inventors
- 👤 Dewey I Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/30; F04D29/281; F04D29/282
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |