US4381330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treated glass-wool mat and the method for making the same
Assignee: AKAGAWA SANGYO COLTD
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Filing: 1981-07-31
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Granted: 1983-04-26
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Expires: 2001-07-31
Abstract
Abstract A glass-wool mat is produced from a sheet of glass fibers by heating the surfaces of the sheet to a temperature close to the melting point of glass so that the glass fibers in the surface area have rounded ends and are shrunk so that they are firmly entangled together. Thus, non-irritating surfaces are provided on the mat.
Inventors
- 👤 Yasuo Gotomyo
- 👤 Yukihiro Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/48; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T428/2933; Y10T428/2964; Y10T428/2973; Y10T428/2975; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/631
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A glass-wool mat including a plurality of glass fibers which are entangled with each other to form a sheet having an inner layer and at least one outer layer, said outer layer being comprised of glass fibers having rounded ends and being crimped to provide a stronger entanglement among the fibers, the glass fibers in the outer layer being more condensed than those in the inner layer.
Claim 2
Dependent Claim
67 words
A glass-wool mat including a plurality of glass fibers which are entangled with each other to form a sheet having an inner layer and at least one outer layer, said outer layer being comprised of glass fibers having rounded ends and being crimped to provide a stronger entanglement among the fibers, the glass fibers in the outer layer being more condensed than those in the inner layer.
Claim 3
Dependent Claim
21 words
A glass-wool mat in accordance with claim 1 in which said outer layer is formed on each side of the sheet.
Claim 4
Dependent Claim
17 words
A glass-wool mat in accordance with claim 1 in which the glass fibers are of alkali-free glass.
Claim 5
Independent Claim
95 words
A method for forming a glass-wool mat comprising steps of gathering glass fibers to form a sheet in which the glass fibers are entangled with each other and then heating at least one surface of the sheet to a temperature close to melting point of glass but lower than a temperature wherein structural changes are produced in the glass fibers so that the glass fibers in the surfaces of the sheet are rounded at their ends and crimped to such an extent that the glass fibers are firmly entangled at the surfaces with each other.
Claim 6
Independent Claim
95 words
A method for forming a glass-wool mat comprising steps of gathering glass fibers to form a sheet in which the glass fibers are entangled with each other and then heating at least one surface of the sheet to a temperature close to melting point of glass but lower than a temperature wherein structural changes are produced in the glass fibers so that the glass fibers in the surfaces of the sheet are rounded at their ends and crimped to such an extent that the glass fibers are firmly entangled at the surfaces with each other.
Claim 7
Dependent Claim
20 words
A method in accordance with claim 4 in which the heating temperature is higher than the melting point of glass.
Claim 8
Dependent Claim
16 words
A method in accordance with claim 5 in which the heating temperature is above 650° C.
Claim 9
Dependent Claim
16 words
A method in accordance with claim 1 in which the heating temperature is above 800° C.
Claim 10
Dependent Claim
31 words
A method in accordance with claim 5 which further includes a step of blowing air to the heated surface of the sheet to thereby remove free fibers from the sheet surface.
References Cited (Backward Citations)
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US3532482A
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US3338777A
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US3575789A
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US3684474A
Cited
US4158555A
Cited
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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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |