Patent US3889038A successfully refreshed from Google Patents.
US3889038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated filament and method of forming same
Assignee: Individual
•
Filing: 1969-07-11
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Granted: 1975-06-10
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Expires: 1989-07-11
Abstract
Abstract This invention is directed to filaments and the method of making such filament in which at least the outer filament surface is marked with holes, pocks or depressions which occlude air and tend to impart a high insulating effect due to occlusion of air between filaments, the filaments being formed by inclusion of a gas-forming agent which may be a dissolved volatile solvent or a heat-decomposable azo compound, so that the coated filament upon heating forms bubbles which burst, at least on the surface, leaving the open pock, air insulation markings.
Inventors
- 👤 Sol B Wiczer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/36; A; A46; A46D; A46D1/00; A46D1/02; A46D1/023; C; C03; C03C; C03C25/00; C03C25/10; C03C25/465; C03C25/47; D01; D01D; D01D11/00; D01D11/06; D01D5/00; D01D5/24; D01D5/247; D01F; D01F8/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/2938
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
SEPARATE INDIVIDUAL FILAMENTS EACH CAPABLE OF USE AS ARTIFICIAL FIBER COMPRISING A FILAMENT CORE HAVING A SUBSTANTIALLY EVEN CONTINUOUS PLASTIC FILM SURFACE COATING THEREON, INTERRUPTED ONLY BY OPEN POCKS AND PORES IN SAID SURFACE COATING.
Claim 2
Dependent Claim
35 words
SEPARATE INDIVIDUAL FILAMENTS EACH CAPABLE OF USE AS ARTIFICIAL FIBER COMPRISING A FILAMENT CORE HAVING A SUBSTANTIALLY EVEN CONTINUOUS PLASTIC FILM SURFACE COATING THEREON, INTERRUPTED ONLY BY OPEN POCKS AND PORES IN SAID SURFACE COATING.
Claim 3
Dependent Claim
29 words
The filaments defined in claim 1 wherein the continuous film coating is of cellulosic substance having open pocks and pores generated by bursting of bubbles on the surface therein.
Claim 4
Dependent Claim
41 words
The filaments as defined in claim 1 wherein both the filameNt core and the coating are porous, the porosity in each being developed by activation of different gas-forming substances to provide open pocks and pores in the outer coating film surface.
Claim 5
Dependent Claim
14 words
The filaments as defined in claim 1 wherein the filament core is thermally stable.
Claim 6
Independent Claim
80 words
The method of forming separate individual thermoplastic filaments capable of use as artificial fiber, each filament having a porous surface texture comprising coating extruded individual filament cores each with a continuous thermoplastic film containing a gas-forming agent selected from the group consisting of volatile solvents dissolved in said film and solid heat decomposable azo compounds, and then heating the individual coated filaments to activate the gas-forming agent to develop gas and form open pocks and pores in said filament surface.
Claim 7
Independent Claim
80 words
The method of forming separate individual thermoplastic filaments capable of use as artificial fiber, each filament having a porous surface texture comprising coating extruded individual filament cores each with a continuous thermoplastic film containing a gas-forming agent selected from the group consisting of volatile solvents dissolved in said film and solid heat decomposable azo compounds, and then heating the individual coated filaments to activate the gas-forming agent to develop gas and form open pocks and pores in said filament surface.
Claim 8
Dependent Claim
12 words
The method of claim 5 wherein the filament core is thermally stable.
Claim 9
Dependent Claim
11 words
The method of claim 5 wherein the filament core is glass.
Claim 10
Dependent Claim
11 words
The filaments as defined in claim 1 chopped into short lengths.
Claim 11
Dependent Claim
38 words
The filaments as defined in claim 1 wherein the coating comprises polymer selected from the group consisting of polystyrene, polyurethane, polyacrylonitrile, polybutadiene, polycyclopentadiene, poly-2-chloro-butadiene, copolymers of styrene and butadiene and polymerized solutions of preformed rubber in styrene monomer.
Claim 12
Dependent Claim
20 words
The filaments as defined in claim 9 wherein the core material is heat stable and is chopped into short lengths.
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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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |