Patent US4373992A successfully refreshed from Google Patents.
US4373992A
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Non-asbestos flooring felt containing particulate inorganic filler, a mixture of fibers and a binder
Assignee: Tarkett AB
•
Filing: 1981-03-31
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Granted: 1983-02-15
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Expires: 2001-03-31
Abstract
Abstract Flooring felt containing glass fibers, cellulosic fibers, synthetic fibers, particulate inorganic filler, latex binder and calcium hydroxide.
Inventors
- 👤 Alfredo A. Bondoc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:42
CPC Classifications
D; D06; D06N; D06N7/00; D06N7/0005; D06N7/0039; D06N7/0052; D06N7/0055; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21H13/36; D21H13/38; D21H13/40; D21H21/00; D21H21/50; D21H21/52; D21H23/00; D21H23/76; D21H23/765; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T442/00; Y10T442/50; Y10T442/51; Y10T442/53
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
Sheet type felt comprising on a dry basis; (a) between about 1 and about 10 wt. % glass fibers; (b) between about 3 and about 25 wt % cellulosic fibers; (c) between about 3 and about 20 wt % synthetic organic fibers; (d) between about 3 and about 70 wt % particulate inorganic filler; (e) between about 10 and about 30 wt % latex binder; (f) between about 3 and about 80 wt % calcium hydroxide; and (g) between about 0.1 and about 10 pounds polymeric flocculating agent per ton of felt.
Claim 2
Dependent Claim
92 words
Sheet type felt comprising on a dry basis; (a) between about 1 and about 10 wt. % glass fibers; (b) between about 3 and about 25 wt % cellulosic fibers; (c) between about 3 and about 20 wt % synthetic organic fibers; (d) between about 3 and about 70 wt % particulate inorganic filler; (e) between about 10 and about 30 wt % latex binder; (f) between about 3 and about 80 wt % calcium hydroxide; and (g) between about 0.1 and about 10 pounds polymeric flocculating agent per ton of felt.
Claim 3
Dependent Claim
33 words
Felt according to claim 1 wherein at least a portion of the latex and calcium hydroxide is present in the form of precipitation product uniformly distributed onto particles of filler and onto fibers.
Claim 4
Dependent Claim
11 words
Felt according to claim 1 which is essentially free of asbestos.
Claim 5
Dependent Claim
11 words
Felt according to claim 2 wherein the synthetic fiber comprises polyolefin.
Claim 6
Dependent Claim
11 words
Felt according to claim 4 wherein the polyolefin is fibrillated polyproylene.
Claim 7
Dependent Claim
28 words
Felt according to claim 1 wherein the glass fibers have average diameters in excess of about 3 microns and fiber lengths between about 0.5 and about 6 mm.
Claim 8
Dependent Claim
18 words
Felt according to claim 1 wherein the filler has an average particle size less than about 30 microns.
Claim 9
Dependent Claim
11 words
Felt according to claim 7 wherein the filler comprises kaolin clay.
Claim 10
Dependent Claim
11 words
Felt according to claim 1 wherein the filler comprises calcium hydroxide.
Claim 11
Dependent Claim
10 words
Felt according to claim 1 wherein the flocculant is polyacrylamide.
Claim 12
Dependent Claim
13 words
Felt according to claim 1 wherein the latex binder comprises anionic synthetic rubber.
Claim 13
Dependent Claim
12 words
Felt according to claim 1 wherein the latex comprises carboxylated styrene-butadiene rubber.
Claim 14
Dependent Claim
63 words
Felt according to claim 1 wherein: a. the synthetic fiber comprises fibrillated polyolefin; b. the glass fibers have average diameters in excess of 3 microns and fiber lengths between about 0.5 and about 6 mm; c. the filler has an average particle size less than about 30 microns; d. the latex binder comprises anionic synthetic rubber; and e. the flocculating agent comprises polyacrylamide.
Claim 15
Dependent Claim
22 words
Felt according to claim 1 which also includes at least about 5 weight percent on a dry basis of process mineral fiber.
Claim 16
Dependent Claim
31 words
Felt according to claim 14 wherein the mineral fiber has diameter between about 1 and about 10 micron and aspect ratios between about 40 to 1 and about 60 to 1.
References Cited (Backward Citations)
US2138456A
Cited
US2802765A
Cited
US3248257A
Cited
US4225383A
Cited
US4245689A
Cited
US4293612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |