Patent US2214737A successfully refreshed from Google Patents.
US2214737A
Expired / Lapsed
US
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Air purification
Assignee: W B CONNOR ENGINEERING CORP
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Filing: 1936-09-03
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Granted: 1940-09-17
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Expires: 1956-09-03
Abstract
No abstract record available.
Inventors
- 👤 George S Dauphinee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0446; F; F24; F24F; F24F3/00; F24F3/12; F24F3/16; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/104; B01D2253/106; B01D2257/00; B01D2257/90; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40084; B01D2259/40088; B01D2259/4009; B01D2259/45; B01D2259/4508
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-09-17 | 1944-03-18 | 1944-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-17 | 1948-03-18 | 1948-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-17 | 1952-03-18 | 1952-09-17 | $7700.00 | Window Closed / Lapsed |