Patent US5077870A successfully refreshed from Google Patents.
Patent US2739916A successfully refreshed from Google Patents.
US2739916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filter cartridges
Assignee: Fram Corp
•
Filing: 1953-12-08
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Granted: 1956-03-27
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Expires: 1973-12-08
Abstract
No abstract record available.
Inventors
- 👤 Elliot J Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:57
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A FILTER ELEMENT THE METHOD OF SECURING METAL CLOSURE DISCS TO THE ENDS OF AN ANNULUS OF POROUS PLEATED FIBROUS MATERIAL HAVING THE PLEATS EXTENDING LENGTHWISE OF THE ANNULUS, WHICH COMPRISES PROVIDING A METAL DISC FOR EACH END OF THE ANNULUS, COATING ONE FACE OF EACH DISC WITH A LACQUER FILM, APPLYING A LAYER OF A SOLVENT-FREE PASTE FORMED OF A VINYL RESIN POWDER AND A PLASTICIZER OVER THE LACQUER FILM, FORCING THIS COATED FACE AGAINST THE ZIGZAG END FOLDS OF THE ANNULUS TO EMBED THE END FOLDS IN THE PASTE, AND HEATING THE DISC WHILE IT IS HELD AGAINST SAID END TO THE VINYL SOFTENING POINT TO THEREBY TRANSFORM THE RESIN FROM A LIQUID DISPERSION TO A CONTINUOUS PHASE THAT WILL PENETRATE DEEP INTO THE POROUS FIBROUS MATERIAL AND WILL ALSO BOND FIRMLY TO THE LACQUER FILM ON THE DISC.
Claim 2
Dependent Claim
142 words
IN A FILTER ELEMENT THE METHOD OF SECURING METAL CLOSURE DISCS TO THE ENDS OF AN ANNULUS OF POROUS PLEATED FIBROUS MATERIAL HAVING THE PLEATS EXTENDING LENGTHWISE OF THE ANNULUS, WHICH COMPRISES PROVIDING A METAL DISC FOR EACH END OF THE ANNULUS, COATING ONE FACE OF EACH DISC WITH A LACQUER FILM, APPLYING A LAYER OF A SOLVENT-FREE PASTE FORMED OF A VINYL RESIN POWDER AND A PLASTICIZER OVER THE LACQUER FILM, FORCING THIS COATED FACE AGAINST THE ZIGZAG END FOLDS OF THE ANNULUS TO EMBED THE END FOLDS IN THE PASTE, AND HEATING THE DISC WHILE IT IS HELD AGAINST SAID END TO THE VINYL SOFTENING POINT TO THEREBY TRANSFORM THE RESIN FROM A LIQUID DISPERSION TO A CONTINUOUS PHASE THAT WILL PENETRATE DEEP INTO THE POROUS FIBROUS MATERIAL AND WILL ALSO BOND FIRMLY TO THE LACQUER FILM ON THE DISC.
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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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |