US3226251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing filter elements
Assignee: Motors Liquidation Co
•
Filing: 1961-05-04
•
Granted: 1965-12-28
•
Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 James A Norton
- 👤 Robert E Holloway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:56
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A PROCESS FOR MAKING PAPER FILTER ELEMENTS THE STEPS COMPRISING IMPREGNATING THE FILTER PAPER WITH A HOMOGENEOUS LIQUID COMPOSITION CONTAINING ABOUT 100 PARTS BY WEIGHT OF RESOLE, ABOUT 20 TO 28 PARTS BY WEIGHT OF A THERMOPLASTIC LIGNIN-TYPE SUBSTANTIALLY PETROLEUM HYDROCARBON-INSOLUBLE RESINOUS MATERIAL DERIVED FROM WOOD AND CONTAINING BOTH METHOXYL AND HYDROXYL GROUPS, AND ABOUT 17 TO 20 PARTS BY WEIGHT OF WATER AND DRYING THE IMPREGNATED FILTER PAPER AT A RELATIVELY LOWER TEMPERATURE TO EVEPORATE MOST OF THE VOLATILE CONSTITUENTS.
Claim 2
Dependent Claim
82 words
IN A PROCESS FOR MAKING PAPER FILTER ELEMENTS THE STEPS COMPRISING IMPREGNATING THE FILTER PAPER WITH A HOMOGENEOUS LIQUID COMPOSITION CONTAINING ABOUT 100 PARTS BY WEIGHT OF RESOLE, ABOUT 20 TO 28 PARTS BY WEIGHT OF A THERMOPLASTIC LIGNIN-TYPE SUBSTANTIALLY PETROLEUM HYDROCARBON-INSOLUBLE RESINOUS MATERIAL DERIVED FROM WOOD AND CONTAINING BOTH METHOXYL AND HYDROXYL GROUPS, AND ABOUT 17 TO 20 PARTS BY WEIGHT OF WATER AND DRYING THE IMPREGNATED FILTER PAPER AT A RELATIVELY LOWER TEMPERATURE TO EVEPORATE MOST OF THE VOLATILE CONSTITUENTS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |