Patent US3607543A successfully refreshed from Google Patents.
US3607543A
Expired / Lapsed
US
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Process for forming lightweight nylon nonwoven web
Assignee: ROBERT P TEULINGS
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Filing: 1969-03-21
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Granted: 1971-09-21
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Expires: 1989-03-21
Abstract
Abstract A method of forming a lightweight nonwoven bonded web of nylon comprises collecting nylon filaments on a moving foraminous belt at a rate to form a web which weighs less than 1 oz/yd2, providing a vacuum beneath the belt, contacting the web while on the belt with an activating gas to lightly bond the filaments together at filament crossover points, and removing the web from the belt prior to the belt''s entering an arc around a beltsupporting roller.
Inventors
- 👤 Philip J Stevenson
- 👤 Robert P Teulings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:46
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T442/00; Y10T442/60; Y10T442/69
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
The process of claim 1 wherein said filaments are autogenously bonded together at a substantial number of filament crossover points.
Claim 2
Dependent Claim
53 words
The process of claim 2 wherein said autogenously bonding said filaments include the steps of subjecting said web to an activating gas, said gas being at least partially absorbed by said filaments and desorbing said gas from said filaments to permanently bond said filaments together at a substantial number of said crossover points.
Claim 3
Dependent Claim
17 words
The process of claim 3 wherein said desorbing is substantially completed by subjecting said web to heat.
Claim 4
Dependent Claim
33 words
The process of claim 4 wherein said web is calendered while on said belt prior to said web removal by means of press rolls spaced in alignment on either side of said belt.
Claim 5
Dependent Claim
28 words
The process of claim 4 wherein said filaments of said web are lightly bonded together at selected filament crossover points prior to said web removal from said belt.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said filaments are less than 10 dpf.
Claim 7
Dependent Claim
34 words
The process of claim 4 wherein said filaments are preferentially arranged in a first selected direction within said fabric to increase the fabric tenacity in said first selected direction relative a second selected direction.
Claim 8
Dependent Claim
24 words
The process of claim 8 wherein the ratio of said first selected direction tenacity to said second selected direction tenacity is greater than 1.50.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |