US4631933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stitch-bonded thermal insulating fabrics
Assignee: 3M Co
•
Filing: 1984-10-12
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Granted: 1986-12-30
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Expires: 2004-10-12
Abstract
Abstract A thermal insulating fabric is described. The fabric is a stitch-bonded, fibrous, nonwoven web of microfibers that average about 10 micrometers or less in diameter.
Inventors
- 👤 Patrick H. Carey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:10
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/14; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/52; D04H1/54; D04H1/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A stable, thermal insulating fabric comprising a stitch-bonded, fibrous, nonwoven web of microfibers that average less than about 10 micrometers in diameter, said fabric having thermal resistance per basis weight of at least about 0.00030 k.m 2 /watt/g/m 2 and air permeability of less than about 1 m 3 /sec/m 2 .
Claim 2
Dependent Claim
52 words
A stable, thermal insulating fabric comprising a stitch-bonded, fibrous, nonwoven web of microfibers that average less than about 10 micrometers in diameter, said fabric having thermal resistance per basis weight of at least about 0.00030 k.m 2 /watt/g/m 2 and air permeability of less than about 1 m 3 /sec/m 2 .
Claim 3
Dependent Claim
11 words
The fabric of claim 1 wherein said web comprises blown microfibers.
Claim 4
Dependent Claim
48 words
The fabric of claim 1 wherein said web further comprises crimped bulking fibers that have a percent crimp of at least 15 percent intermixed and intertangled with said microfibers, with the weight ratio of microfibers to crimped bulking fibers in the range of from about 9:1 to 1:9.
Claim 5
Dependent Claim
11 words
The fabric of claim 3 wherein said web comprises blown microfibers.
Claim 6
Dependent Claim
17 words
The fabric of claim 1 wherein the thermal resistance is at least about 0.035 k.m 2 /watt.
Claim 7
Dependent Claim
30 words
The fabric of claim 1 wherein the tensile strength is at least about 15 kg in the stitch-bonding machine direction and at least about 10 kg in the transverse direction.
Claim 8
Dependent Claim
18 words
The fabric of claim 1 wherein the stitch length of said stitch-bonding is about 1.0 to 2.5 mm.
Claim 9
Dependent Claim
19 words
The fabric of claim 1 wherein the stitch gauge of said stitch-bonding is about 3.5 to 28 yarns/25 mm.
Claim 10
Dependent Claim
40 words
The fabric of claim 1 wherein said stitch-bonding comprises a repeating pattern of spaced-apart stitching lines extending over the entire area of the web, at least some of said stitching lines overlapping with one another over portions of their length.
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |