US4704856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
False twisted differential tension yarn
Assignee: EIDP Inc
•
Filing: 1986-04-30
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Granted: 1987-11-10
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Expires: 2006-04-30
Abstract
Abstract A continuous multifilament crimped polyamide or polypropylene yarn suitable for use in loop pile carpeting and the process for making the yarn including feeding the yarn at different tensions and then treating the yarn with saturated steam is disclosed.
Inventors
- 👤 Thomas L. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:55
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G3/00; D02G3/22; D02G3/44; D02G3/445
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A continuous multifilament crimped polyamide yarn suitable for use in loop pile carpeting comprising at least one continuous multifilament crimped core yarn and at least one continuous multifilament crimped wrap yarn characterized by: (a) the filaments of the wrap yarn being from 1 to 14% longer than the filaments of the core yarn; (b) some of the filaments within the wrap yarn being lightly bonded to each other and to some of the filaments of the core yarn; (c) the wrap yarn being wrapped around the core yarn in random reversing coils; and (d) the wrap yarn being tightly wrapped around the core yarn.
Claim 2
Dependent Claim
104 words
A continuous multifilament crimped polyamide yarn suitable for use in loop pile carpeting comprising at least one continuous multifilament crimped core yarn and at least one continuous multifilament crimped wrap yarn characterized by: (a) the filaments of the wrap yarn being from 1 to 14% longer than the filaments of the core yarn; (b) some of the filaments within the wrap yarn being lightly bonded to each other and to some of the filaments of the core yarn; (c) the wrap yarn being wrapped around the core yarn in random reversing coils; and (d) the wrap yarn being tightly wrapped around the core yarn.
Claim 3
Dependent Claim
104 words
A continuous multifilament crimped polypropylene yarn suitable for use in loop pile carpeting comprising at least one continuous multifilament crimped core yarn and at least one continuous multifilament crimped wrap yarn characterized by: (a) the filaments of the wrap yarn being from 1 to 14% longer than the filaments of the core yarn; (b) some of the filaments within the wrap yarn being lightly bonded to each other and to some of the filaments of the core yarn; (c) the wrap yarn being wrapped around the core yarn in random reversing coils; and (d) the wrap yarn being tightly wrapped around the core yarn.
Claim 4
Dependent Claim
104 words
A continuous multifilament crimped polypropylene yarn suitable for use in loop pile carpeting comprising at least one continuous multifilament crimped core yarn and at least one continuous multifilament crimped wrap yarn characterized by: (a) the filaments of the wrap yarn being from 1 to 14% longer than the filaments of the core yarn; (b) some of the filaments within the wrap yarn being lightly bonded to each other and to some of the filaments of the core yarn; (c) the wrap yarn being wrapped around the core yarn in random reversing coils; and (d) the wrap yarn being tightly wrapped around the core yarn.
Claim 5
Dependent Claim
21 words
The yarn of claim 2 further characterized by the wrap yarn having cylinder bulk of about 70-90% of the core yarn.
Claim 6
Dependent Claim
25 words
The yarn of claim 1 or 2 further characterized by a twist after boil-off of at least one twist per inch (39 twists per meter).
Claim 7
Dependent Claim
13 words
The yarn of claim 4 wherein the yarn has essentially no true twist.
Claim 8
Dependent Claim
24 words
The yarn of claim 1 wherein the yarn has a twist after boil-off of at least two twists per inch (79 twists per meter).
Claim 9
Dependent Claim
15 words
The yarn of claims 1 or 2 further comprising less than 10% of uncrimped filaments.
Claim 10
Dependent Claim
11 words
The yarn of claim 7 wherein the uncrimped filaments are antistatic.
Claim 11
Dependent Claim
21 words
The yarn of claim 1 further characterized by the wrap yarn having cylinder bulk of about 70-85% of the core yarn.
Claim 12
Dependent Claim
12 words
The yarn of claim 1 wherein the crimped core yarn is polypropylene.
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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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |