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Patent US2734594A successfully refreshed from Google Patents.
US2734594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filtering cleaners
Assignee: —
•
Filing: —
•
Granted: 1956-02-14
•
Expires: 1973-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/365; A47L9/00; A47L9/10; A47L9/14; A47L9/1427; Y; Y10; Y10S; Y10S55/00; Y10S55/02; Y10S55/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1701782A
Cited
US2049602A
Cited
US2244843A
Cited
US2327810A
Cited
US2520877A
Cited
US2639001A
Cited
US2652902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-13 | 1959-08-15 | 1960-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-13 | 1963-08-15 | 1964-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-13 | 1967-08-15 | 1968-02-14 | $7700.00 | Window Closed / Lapsed |