Patent US2354294A successfully refreshed from Google Patents.
US4906535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cathode and materials therefor
Assignee: Yardney Technical Products Inc
•
Filing: 1988-12-20
•
Granted: 1990-03-06
•
Expires: 2008-12-20
Abstract
Abstract There is disclosed a process for producing an electrochemical cathode for an electrochemical cell comprised of a current collecting layer or substrate laminated between layers of a nonwoven conductive fibrous web, preferably of conductive carbon fibers, impregnated with a mixture of carbon particles and a nonfibrous polymeric substance, and optionally with a hydrophobic microporous film or layer disposed on one of the layers of the nonwoven conductive fibrous web as well as the product produced thereby.
Inventors
- 👤 William H. Hoge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:28
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; H01M4/00; H01M4/86; H01M4/88; H01M4/8817; H01M4/8821; H01M4/8825; H01M4/8828; H01M4/8878; H01M4/8882; H01M4/8896; H01M4/96; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49112
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
57 words
An electrochemical cathode, which comprises: a current collecting substrate capable of being connected to electrical circuitry; and conductive nonwoven webs laminated to said current collecting substrate and impregnated with a mixture of carbon particles and a nonfibrous polymeric substance for holding said carbon particles in said web, said conductive nonwoven web being formed of conductive carbon fibers.
Claim 2
Dependent Claim
57 words
An electrochemical cathode, which comprises: a current collecting substrate capable of being connected to electrical circuitry; and conductive nonwoven webs laminated to said current collecting substrate and impregnated with a mixture of carbon particles and a nonfibrous polymeric substance for holding said carbon particles in said web, said conductive nonwoven web being formed of conductive carbon fibers.
Claim 3
Dependent Claim
23 words
The electrochemical cathode as defined in claim 1 and further including a hydrophobic polymeric film bonded to one of said conductive nonwoven webs.
Claim 4
Dependent Claim
24 words
The electrochemical cathode as defined in claim 1 or 2 wherein said carbon fibers are of a diameter of from about 5.0 to 15.0μ.
Claim 5
Dependent Claim
23 words
The electrochemical cathode as defined in claim 3 wherein said carbon fibers are of a length of from about 0.5 to 1.25 inches.
Claim 6
Dependent Claim
28 words
The electrochemical cathode as defined in claim 1 or 2 wherein said carbon fibers of said conductive nonwoven web exhibit a resistance of less than about 20 ohms/sq.
Claim 7
Dependent Claim
26 words
The electrochemical cathode as defined in claim 1 or 2 wherein said conductive nonwoven web provides a front-to-back electrical conductivity of less than about 1 ohm.
Claim 8
Dependent Claim
25 words
The electrochemical cathode as defined in claim 1 or 2 wherein said carbon particles have a surface area greater than about 1000 m. 2 /g.
Claim 9
Dependent Claim
18 words
The electrochemical cathode as defined in claim 1 or 2 wherein said current collecting substrate is metal mesh.
Claim 10
Dependent Claim
26 words
The electrochemical cathode as defined in claim 1 or 2 wherein said current collecting substrate is bonded by a sealing material to said conductive nonwoven webs.
Claim 11
Dependent Claim
17 words
The electrochemical cathode as defined in claim 9 wherein said sealing material is a dispersion of PTFE.
Claim 12
Dependent Claim
20 words
The electrochemical cathode as defined in claim 2 wherein said hydrophobic polymeric film is embossed onto said conductive nonwoven web.
Claim 13
Dependent Claim
19 words
The electrochemical cathode as defined in claim 2 or 11 wherein said hydrophobic polymeric film is formed of polytetrafluoroethylene.
Claim 14
Dependent Claim
16 words
The electrochemical cathode as defined in claim 1 or 2 wherein said mixture includes a catalyst.
Claim 15
Dependent Claim
23 words
The electrochemical cathode as defined in claim 13 wherein said catalyst is selected from the group consisting of potassium permanganate and silver oxide.
Claim 16
Dependent Claim
53 words
A process for forming an electrochemical cathode, which comprises: (a) impregnating a conductive nonwoven fibrous web with a dispersion comprised of carbon particles and a nonfibrous polymeric material for holding said carbon particles to said web. (b) laminating a current collecting substrate between layers of said impregnated web to form said electrochemical cathode.
Claim 17
Dependent Claim
53 words
A process for forming an electrochemical cathode, which comprises: (a) impregnating a conductive nonwoven fibrous web with a dispersion comprised of carbon particles and a nonfibrous polymeric material for holding said carbon particles to said web. (b) laminating a current collecting substrate between layers of said impregnated web to form said electrochemical cathode.
Claim 18
Dependent Claim
39 words
The process for forming an electrochemical cathode as defined in claim 15 and further including the steps of forming and drying a sandwich of said current collecting substrate and said layers of said impregnated web prior to step (b).
Claim 19
Dependent Claim
26 words
The process for forming an electrochemical cathode as defined in claim 16 wherein drying is effected at a temperature of from 200° F. to 300° F.
Claim 20
Dependent Claim
26 words
The process for forming an electrochemical cathode as defined in claim 15, 16 or 17 wherein said current collecting substrate is coated with a polytetrafluoroethylene dispersion.
Claim 21
Dependent Claim
27 words
The process for forming an electrochemical cathode as defined in claim 18, wherein laminating is effected at a temperature of about 150° F. to about 400° F.
Claim 22
Dependent Claim
19 words
The process for forming an electrochemical cathode as defined in claim 15 wherein said nonfibrous polymeric material is polytetrafluoroethylene.
Claim 23
Dependent Claim
32 words
The process for forming an electrochemical cathode as defined in claim 15 and further including a polymeric film in said sandwich in contact with one of said layers of said impregnated web.
Claim 24
Dependent Claim
32 words
The process for forming an electrochemical cathode as defined in claim 16 and further including a polymeric film in said sandwich in contact with one of said layers of said impregnated web.
Claim 25
Dependent Claim
29 words
The process for forming an electrochemical cathode as defined in claim 21 or 22 wherein step (b) is effected with an embossing roller in contact with said polymeric film.
Claim 26
Dependent Claim
29 words
The process for forming an electrochemical cathode as defined in claim 21 or 22 wherein said current collecting substrate is coated with a polytetrafluoroethylene dispersion prior to step (b).
Claim 27
Dependent Claim
26 words
The process for forming an electrochemical cathode as defined in claim 24 wherein drying is effected at a temperature of from 200° F. to 300° F.
Claim 28
Dependent Claim
27 words
The process for forming an electrochemical cathode as defined in claim 25 wherein step (b) is effected with an embossing roller in contact with said polymeric film.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |