US2195565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Bullard Co
•
Filing: 1937-09-17
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Granted: 1940-04-02
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Expires: 1957-09-17
Abstract
No abstract record available.
Inventors
- 👤 Fricke William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:52
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0415; B01D53/26; B01D53/261; B01D53/265; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/70; B01D2257/708; B01D2257/80; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40084; B01D2259/414; B01D2259/4141; B01D2259/4145; B01D2259/4146; B01D2259/45; B01D2259/4533; B01D2259/455
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) | 1943-04-02 | 1943-10-02 | 1944-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-02 | 1947-10-02 | 1948-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-02 | 1951-10-02 | 1952-04-02 | $7700.00 | Window Closed / Lapsed |