US4351683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming web material
Assignee: 3M Co
•
Filing: 1970-10-23
•
Granted: 1982-09-28
•
Expires: 1990-10-23
Abstract
Abstract A method of forming a resilient open fibrous web of inter-engaged coarse continuous kinky filaments, with one major surface of the web being flattened. The method involves extruding a bundle of filaments of a thermoplastic material, aligning the bundle so the filaments fall into a quench bath and upon a contact surface so as to provide differential quenching, and advancing the resulting web at a slower rate than the rate of extrusion.
Inventors
- 👤 LeRoy I. Kusilek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:21
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; B; B32; B32B; B32B27/00; D01; D01D; D01D5/00; D01D5/22; D04H11/00; D04H11/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
Method of making a smooth-surfaced open porous integrated mat of continuous crinkled filaments by continuous differential quenching, which comprises extruding a hot filament-forming extrudable thermoplastic polymeric material in the form of a bundle of closely-spaced separate continuous filaments, permitting said filaments to fall under their own weight toward the surface of a liquid quench bath, maintaining a contact surface above said quench bath surface in a position to permit brief glancing contact with at least a portion of the outer filaments of said bundle while permitting the remaining filaments of said bundle to fall directly to said bath surface, allowing the filaments to fall into the quench bath, and advancing the resulting bundle of filaments within said quench bath at a linear speed substantially less than the extrusion speed of said filaments, whereby to cause crinkling and inter-engagement of said filaments into a lightly unified mat having a flat surface area of increased density.
Claim 2
Dependent Claim
154 words
Method of making a smooth-surfaced open porous integrated mat of continuous crinkled filaments by continuous differential quenching, which comprises extruding a hot filament-forming extrudable thermoplastic polymeric material in the form of a bundle of closely-spaced separate continuous filaments, permitting said filaments to fall under their own weight toward the surface of a liquid quench bath, maintaining a contact surface above said quench bath surface in a position to permit brief glancing contact with at least a portion of the outer filaments of said bundle while permitting the remaining filaments of said bundle to fall directly to said bath surface, allowing the filaments to fall into the quench bath, and advancing the resulting bundle of filaments within said quench bath at a linear speed substantially less than the extrusion speed of said filaments, whereby to cause crinkling and inter-engagement of said filaments into a lightly unified mat having a flat surface area of increased density.
Claim 3
Dependent Claim
20 words
Method of claim 1 wherein the ratio of advancing speed to extrusion speed is between about 1:2 and about 1:7.
Claim 4
Dependent Claim
21 words
Method of claim 1 wherein the polymeric material is extruded as filaments having a diameter between about 5 and 125 mils.
Claim 5
Dependent Claim
21 words
Method of claim 3 wherein the polymeric material is extruded as filaments having a diameter between about 15 and 35 mils.
References Cited (Backward Citations)
US1685640A
Cited
US1672943A
Cited
CH200324A
Cited
US2395371A
Cited
US2455174A
Cited
US2366278A
Cited
US2439034A
Cited
US2577214A
Cited
US2473528A
Cited
US2696639A
Cited
FR1077225A
Cited
US2746086A
Cited
US2940886A
Cited
US2780909A
Cited
US2736676A
Cited
GB795444A
Cited
US2939177A
Cited
US3026272A
Cited
US3148101A
Cited
US3029124A
Cited
US3288582A
Cited
US3060501A
Cited
US3080611A
Cited
US3236616A
Cited
US3314840A
Cited
US3304220A
Cited
US3295942A
Cited
FR1347178A
Cited
US3333040A
Cited
US3439085A
Cited
US3423266A
Cited
US3368934A
Cited
FR1459929A
Cited
US3522025A
Cited
US3512230A
Cited
US3539676A
Cited
US3341394A
Cited
US3542615A
Cited
US3691004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |