US3325973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purification
Assignee: Evening News Publishing Co
•
Filing: 1964-06-08
•
Granted: 1967-06-20
•
Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Robert H Illingworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:32
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD FOR REMOVING FOREIGN PARTICLES COMPRISING INK AND LINT FROM AIR WHICH COMPRISES DIRECTING SAID AIR THROUGH A FILTER ELEMENT, ENTRAPPING SAID PARTICLES COMPRISING INK, AND LINT IN SAID ELEMENT, CONTINUOUSLY WETTING SAID FILTER ELEMENT WITH AN AQUEOUS SOLUTION COMPRISING A SMALL EFFECTIVE AMOUNT BUT LESS THAN ABOUT 1.0 PERCENT BY WEIGHT OF A WATER SOLUBLE NON-IONIC WETTING AGENT, SAID WETTING AGENT HAVING THE STRUCTURAL FORMUAL
Claim 2
Independent Claim
67 words
A METHOD FOR REMOVING FOREIGN PARTICLES COMPRISING INK AND LINT FROM AIR WHICH COMPRISES DIRECTING SAID AIR THROUGH A FILTER ELEMENT, ENTRAPPING SAID PARTICLES COMPRISING INK, AND LINT IN SAID ELEMENT, CONTINUOUSLY WETTING SAID FILTER ELEMENT WITH AN AQUEOUS SOLUTION COMPRISING A SMALL EFFECTIVE AMOUNT BUT LESS THAN ABOUT 1.0 PERCENT BY WEIGHT OF A WATER SOLUBLE NON-IONIC WETTING AGENT, SAID WETTING AGENT HAVING THE STRUCTURAL FORMUAL
References Cited (Backward Citations)
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US2513174A
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US2585659A
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US2601519A
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US2596093A
Cited
US2877866A
Cited
US3155470A
Cited
US3142548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |