US3096230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1960-06-23
•
Granted: 1963-07-02
•
Expires: 1980-06-23
Abstract
No abstract record available.
Inventors
- 👤 Southwick W Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A METHOD OF MAKING A FILTER MEDIUM COMPRISING IMPREGNATING PAPER FIBERS WITH FROM 1 1/2% TO 2% OF AN OIL-INSOLUBLE THERMOSETTING RESIN, BASED UPON THE WEIGHT OF SAID FIBERS, FORMING THE IMPREGNATED FIBERS INTO A SHEET, COATING SAID SHEET WITH A PHENOL FORMALDEHYDE RESIN AND PARTIALLY CURING THE SAME, THEREAFTER COATING SAID SHEET WITH FROM 2% TO 5% OF COLD PRESSED CASTOR OIL, BASED UPON THE COMBINED WEIGHT OF THE OTHER MATERIALS PRESENT, AND FINALLY CURING COATING MATERIALS AT AN ELEVEATED TEMPERATURE.
References Cited (Backward Citations)
US2317487A
Cited
US2343429A
Cited
US2563897A
Cited
US2683400A
Cited
US2802405A
Cited
US2875899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-01 | 1966-12-31 | 1967-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-01 | 1970-12-31 | 1971-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-01 | 1974-12-31 | 1975-07-02 | $7700.00 | Window Closed / Lapsed |