US2569575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Owens Corning
•
Filing: 1948-03-05
•
Granted: 1951-10-02
•
Expires: 1968-03-05
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Philipps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:53
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A FILTER COMPRISING A POROUS FILTERING BASE, AND A DUST CATCHING ADHESIVE ON SAID BASE IN THE FORM OF AN ORGANO-INORGANIC SALT OF AN ACID OF PHOSPHOROUS.
Claim 2
Dependent Claim
27 words
A FILTER COMPRISING A POROUS FILTERING BASE, AND A DUST CATCHING ADHESIVE ON SAID BASE IN THE FORM OF AN ORGANO-INORGANIC SALT OF AN ACID OF PHOSPHOROUS.
References Cited (Backward Citations)
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US2178614A
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US2122514A
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US2083132A
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US2071353A
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US2145898A
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US2128782A
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US2262634A
Cited
US2353936A
Cited
US2415113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |