Patent US3343949A successfully refreshed from Google Patents.
Patent US2801674A successfully refreshed from Google Patents.
US2801674A
Expired / Lapsed
US
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Process for preparing a permeable sheet material and product
Assignee: EIDP Inc
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Filing: 1955-06-21
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Granted: 1957-08-06
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Expires: 1975-06-21
Abstract
No abstract record available.
Inventors
- 👤 Swerlick Isadore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D06; D06N; D06N3/00; D06N3/0002; D06N3/0011; D06N3/0015; D06N3/0034; D06N3/007; D06N3/0077; D06N3/04; D06N3/10; D06N3/106; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10S8/00; Y10S8/21; Y10T; Y10T442/00; Y10T442/20; Y10T442/2139
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A PROCESS OF PREPARING PERMEABLE SHEET MATERIAL WHICH COMPRISES PLYING A PLURALITY OF NON-WOVEN MATS OF FIBERS, A NON-WOVEN MAT OF NYLON FIBERS BEING IN THE SURFACE LAYER; CONTRACTING SAID MATS WITH AN EXTENSIBLE POLYMERIC BINDER; PRESSING THE MATS, IN CONTACT WITH THE BINDER TO FORM A COMPACTED STRUCTURE; TREATING THE STRUCTURE WITH AN AQUEOUS SOLUTION OF AN AGENT SELECTED FROM THE GROUP CONSISTING OF ZINC CHLORIDE, FERRIC CHLORIDE, STANNIC CHLORIDE, HYDROCHLORIC ACID AND FERRIC NITRATE TO DEGRADE THE NYLON FIBERS IN THE SURFACE LAYER ONLY OF THE STRUCTURE; AND BREAKING A SUBSTANTIAL PORTION OF THE FIBERS AWAY FROM THE BINDER TO FORM CHANNELS SUBSTANTIALLY CONTIGUOUS WITH A MAJOR PORTION OF THE FIBERS.
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |