US2834730A
Expired / Lapsed
US
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Assignee: Johnson and Johnson
•
Filing: 1956-01-18
•
Granted: 1958-05-13
•
Expires: 1976-01-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Erle V Painter
- 👤 William R Strickel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A FILTER SHEET OF MATTED REGENERATED CELLULOSE FIBERS OF ABOUT 1 TO 2 INCHES IN LENGTH AND COTTON COMPRISING (A) A TOP LAYER CONTAINING ABOUT 2/3 OF THE TOTAL WEIGHT OF THE NON-WOVEN FIBROUS SHEET COMPOSED OF AN ABOUT 50-50 BLEND OF CRIMPED RAYON HAVING ABOUT 6 TO 15 CRIMPS PER INCH, OF ABOUT 19/16 INCH STAPLE LENGTH AND ABOUT 5.5 DENIER, WITH COTTON HAVING FINENESS WEIGHT OF ABOUT 3 TO 6 MICROGRAMS PER INCH, AND (B) A BOTTOM LAYER CONTAINING THE REMAINDER OF THE TOTAL WEIGHT OF SAID SHEET, SAID BOTTOM LAYER CONTAINING SUBSTANTIALLY ALL COTTON FIBERS OF ABOUT 3 TO 6 MICROGRAMS PER INCH, SAID SHEET BEING BONDED WITH AN ADHESIVE BONDING AGENT, SAID BONDING AGENT DEFINING TWO DONTINUOUS ZONES WITHIN SAID SHEET CO-EXTENSIVE WITH THE OPPOSITE EXTERNAL SURFACES THEREOF, EACH OF SAID ADHESIVE CONTAINING ZONES CONTAINING 1/6 TO 1/3 OF THE TOTAL FIBERS IN THE SHEET, THE WEIGHT OF SAID SHEET BASED ON NON-WOVEN FIBERS BEING ABOUT 2 OUNCES PER SQUARE YARD.
Claim 2
Dependent Claim
165 words
A FILTER SHEET OF MATTED REGENERATED CELLULOSE FIBERS OF ABOUT 1 TO 2 INCHES IN LENGTH AND COTTON COMPRISING (A) A TOP LAYER CONTAINING ABOUT 2/3 OF THE TOTAL WEIGHT OF THE NON-WOVEN FIBROUS SHEET COMPOSED OF AN ABOUT 50-50 BLEND OF CRIMPED RAYON HAVING ABOUT 6 TO 15 CRIMPS PER INCH, OF ABOUT 19/16 INCH STAPLE LENGTH AND ABOUT 5.5 DENIER, WITH COTTON HAVING FINENESS WEIGHT OF ABOUT 3 TO 6 MICROGRAMS PER INCH, AND (B) A BOTTOM LAYER CONTAINING THE REMAINDER OF THE TOTAL WEIGHT OF SAID SHEET, SAID BOTTOM LAYER CONTAINING SUBSTANTIALLY ALL COTTON FIBERS OF ABOUT 3 TO 6 MICROGRAMS PER INCH, SAID SHEET BEING BONDED WITH AN ADHESIVE BONDING AGENT, SAID BONDING AGENT DEFINING TWO DONTINUOUS ZONES WITHIN SAID SHEET CO-EXTENSIVE WITH THE OPPOSITE EXTERNAL SURFACES THEREOF, EACH OF SAID ADHESIVE CONTAINING ZONES CONTAINING 1/6 TO 1/3 OF THE TOTAL FIBERS IN THE SHEET, THE WEIGHT OF SAID SHEET BASED ON NON-WOVEN FIBERS BEING ABOUT 2 OUNCES PER SQUARE YARD.
References Cited (Backward Citations)
US2248131A
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US2336797A
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US2288426A
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US2327250A
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US2600845A
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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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |