US2920718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-04-27
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Granted: 1960-01-12
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Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Howell
- 👤 Charles E Paxton
- 👤 John J Kolfenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:27
CPC Classifications
B; B01; B01D; B01D46/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
AN IMPROVED AIR FILTER OF THE OIL-WET IMPINGEMENT TYPE PROVIDED WITH AN AIR INLET AND AIR OUTLET, A MAZE OF FINE MESH WIRE SCREEN ARRANGED WITHIN SAID FRAME AND COATED WITH AN OIL COMPOSITION COMPRISING A MAJOR PROPORTION OF A LUBRICATING OIL HAVING AN SSU VISCOSITY AT 210* F. OF ABOUT 40-100 SECONDS, AND ABOUT 0.05 TO 2.0 PERCENT BY WEIGHT, BASED ON THE TOTAL COMPOSITION, OF A MIXTURE OF LITHIUM AND CALCIUM SOAPS OF HIGH MOLECULAR WEIGHT FATTY ACID, THE MOLAR RATIO OF LITHUM SOAP TO CAL CIUM SOAP IN SAID MIXTURE BEING ABOUT 2:1 TO 8:1, THE MAJOR PROPORTION OF THE FIBERS OF SAID SOAPS BEING AT LEAST ABOUT 5 MICRONS IN LENGTH, SAID COATED MAZE BEING ADAPTED TO REMOVE FINELY DIVIDED SOLID PARTICLES FROM AIR PASSING THROUGH SAID FILTER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |