Patent US3400057A successfully refreshed from Google Patents.
Patent US2765046A successfully refreshed from Google Patents.
US2765046A
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US
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Air purifying device
Assignee: Individual
•
Filing: 1953-11-20
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Granted: 1956-10-02
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Rondholz Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:34
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F25; F25D; F25D17/00; F25D17/04; F25D17/042; F25D2317/00; F25D2317/04; F25D2317/041
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
IN AN AIR PURIFYING DEVICE FOR REFRIGERATORS, AND THE LIKE, AN AIR FILTER MATERIAL COMPRISING AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CARBON, SILICA GEL AND ACTIVATED ALUMINA AND BEING COATED WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF COLLOIDAL SILVER AND COLLOIDAL SILVER OXIDE.
References Cited (Backward Citations)
US1950502A
Cited
US2104589A
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US2117570A
Cited
US2204910A
Cited
US2206705A
Cited
US2222882A
Cited
US2423702A
Cited
US2638179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |