US3844826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dressing sewing thread to reduced friction
Assignee: Bayer AG
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Filing: 1972-12-07
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Granted: 1974-10-29
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Expires: 1992-12-07
Abstract
Abstract A dressed sewing thread of reduced friction, preferably comprising polyester, carrying as a non-friction dressing a polycarbonate-polydimethylsiloxane block copolymer comprising about 8 to 35 percent by weight of polycarbonate segments and about 65 to 92 percent by weight of polydimethylsiloxane sements; the polycarbonate segments are preferably of Bisphenol-A. Preferably the dressing also includes a polydiorganosiloxane present in about 2 to 20 times the weight of the block copolymer.
Inventors
- 👤 F Reich
- 👤 W Kortmann
- 👤 W Buchner
- 👤 W Noll
- 👤 J Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/46; C; C08; C08G; C08G64/00; C08G64/18; C08G64/186; C08L; C08L69/00; C08L83/00; C08L83/04; C08L83/10; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/507; D06M15/513; D06M15/643; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/42; C08G77/448; C08G77/70; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
A LOW-FRICTION SEWING THREAD DRESSED WITH A POLYCARBONATE-POLYDIMETHYLSILOXANE BLOCK COPOLYMER COMPRISING ABOUT 8 TO 35 PERCENT BY WEIGHT OF POLYCARBONATE SEGMENTS OF THE FORMULA
Claim 2
Dependent Claim
24 words
A LOW-FRICTION SEWING THREAD DRESSED WITH A POLYCARBONATE-POLYDIMETHYLSILOXANE BLOCK COPOLYMER COMPRISING ABOUT 8 TO 35 PERCENT BY WEIGHT OF POLYCARBONATE SEGMENTS OF THE FORMULA
Claim 3
Dependent Claim
15 words
The sewing thread of claim 1, carrying about 1 to 7% of solids by weight.
Claim 4
Dependent Claim
41 words
The thread of claim 2, wherein the solids include a polydiorganosiloxane having a viscosity of about 500 to 20,000 cP at 20*C, about 5 to 50 parts by weight of said block copolymer being present per 100 parts of said polydiorganosiloxane.
Claim 5
Dependent Claim
34 words
The thread of claim 3, wherein R'' is methyl, p is about 2 to 5, a is 0, and the polydiorganosiloxane is polydimethylsiloxane having a viscosity of about 1,000 to 10,000 cP at 20*C.
Claim 6
Dependent Claim
11 words
The thread of claim 4, wherein said sewing thread comprises polyester.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |