Patent US4937140A successfully refreshed from Google Patents.
US4937140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorinated carbonaceous fibers
Assignee: Dow Chemical Co
•
Filing: 1989-07-21
•
Granted: 1990-06-26
•
Expires: 2009-07-21
Abstract
Abstract A fiber product comprising a core of a flexible, non-flammable carbonaceous polymeric fibers having an aspect ratio greater than 10:1, and a non-electrically conductive fluorinated surface.
Inventors
- 👤 Francis P. McCullough, Jr.
- 👤 Leo J. Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:28
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/121; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2929; Y10T428/2933; Y10T428/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
A fiber product comprising a core of a flexible, non-flammable linear carbonaceous polymeric fiber having a nitrogen content of about 16 to 20%, an aspect ratio greater than 10:1, and at least a partially non-electrically conductive fluorinated surface.
Claim 2
Dependent Claim
38 words
A fiber product comprising a core of a flexible, non-flammable linear carbonaceous polymeric fiber having a nitrogen content of about 16 to 20%, an aspect ratio greater than 10:1, and at least a partially non-electrically conductive fluorinated surface.
Claim 3
Dependent Claim
13 words
The fiber product of claim 1 which is derived from acrylic based fibers.
Claim 4
Dependent Claim
14 words
The fiber product of claim 1 wherein said carbonaceous fibers have static dissipating characteristics.
Claim 5
Dependent Claim
13 words
The fiber product of claim 1 wherein said carbonaceous fibers are electrically conductive.
Claim 6
Dependent Claim
14 words
The fiber product of claim 1 which is derived from an aromatic polyamide fiber.
Claim 7
Dependent Claim
60 words
A fiber product comprising: a core of a flexible, electroconductive carbonaceous fiber derived from a stabilized polymeric linear carbonaceous fiber precursor material, said fiber having a diameter of 4 to about 20 micrometers, an aspect ratio greater than 10:1, a nitrogen content of about 16 to 20%; and said fiber having at least a partially non-electrically conductive fluorinated surface thereon.
Claim 8
Dependent Claim
60 words
A fiber product comprising: a core of a flexible, electroconductive carbonaceous fiber derived from a stabilized polymeric linear carbonaceous fiber precursor material, said fiber having a diameter of 4 to about 20 micrometers, an aspect ratio greater than 10:1, a nitrogen content of about 16 to 20%; and said fiber having at least a partially non-electrically conductive fluorinated surface thereon.
Claim 9
Dependent Claim
17 words
The fiber product of claim 6 wherein said carbonaceous fiber is derived from an acrylic based fiber.
Claim 10
Dependent Claim
16 words
The fiber product of claim 6 wherein said carbonaceous fiber is derived from an aromatic polyamide.
Claim 11
Dependent Claim
13 words
The fiber product of claim 6 wherein said carbonaceous fiber is electrically conductive.
Claim 12
Dependent Claim
15 words
The fiber product of claim 1 wherein said carbonaceous fibers is derived from stabilized polyacrylonitrile.
Claim 13
Dependent Claim
15 words
The fiber product of claim 6 wherein said carbonaceous fibers is derived from stabilized polyacrylonitrile.
References Cited (Backward Citations)
US3988491A
Cited
US4296151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |