US4465748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fibre paper separator for electrochemical cells
Assignee: HOLLINGSWORTH & VOSE Co Ltd
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Filing: 1983-04-20
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Granted: 1984-08-14
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Expires: 2003-04-20
Abstract
Abstract A separator suitable for electrochemical cells of the lead-acid recombinant type comprises a sheet of entangled glass fibres. It has been found that significant improvements in performance can be obtained when 5 to 35% by weight of the fibres have a diameter of less than 1 mu m. It has also been found surprisingly advantageous if the overall solubility of the glass fibres is greater than 3% and preferably at least 4%, by weight in 5 hours at 85 DEG C. in sulphuric acid of specific gravity 1.200. It has been found that further benefits can accrue if all or a major proportion of the fibres cover a continuous range of fibre diameters and fibre lengths, and preferably a minor proportion of the fibres being over 5 mm in length.
Inventors
- 👤 Frank J. T. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:07
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
36 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein between 5 and 35% by weight of the fibres have a diameter of less than 1 μm.
Claim 2
Dependent Claim
36 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein between 5 and 35% by weight of the fibres have a diameter of less than 1 μm.
Claim 3
Dependent Claim
24 words
A separator according to claim 1 wherein between 10% and 20% by weight of the fibres have a diameter of less than 1 μm.
Claim 4
Dependent Claim
61 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein the overall solubility of the fibres is greater than 3% by weight in 5 hours at 85° C. in sulphuric acid of specific gravity 1.22 and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 5
Dependent Claim
61 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein the overall solubility of the fibres is greater than 3% by weight in 5 hours at 85° C. in sulphuric acid of specific gravity 1.22 and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 6
Dependent Claim
19 words
A separator according to claim 3 wherein the overall solubility of the fibres is at least 4% by weight.
Claim 7
Dependent Claim
54 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein all or a major proportion of the fibres cover a continuous range of fibre diameters and fibre lengths and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 8
Dependent Claim
54 words
A separator suitable for electrochemical cells of the lead-acid recombinant type, comprising a sheet of entangled glass fibres, wherein all or a major proportion of the fibres cover a continuous range of fibre diameters and fibre lengths and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 9
Dependent Claim
22 words
A separator according to claim 5 wherein not more than a minor proportion of the fibres are over 5 mm in length.
Claim 10
Dependent Claim
35 words
In an electrochemical cell of the lead-acid recombinant type, incorporating a separator of entangled glass fibres, the improvement wherein less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 11
Dependent Claim
35 words
In an electrochemical cell of the lead-acid recombinant type, incorporating a separator of entangled glass fibres, the improvement wherein less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 12
Dependent Claim
65 words
In an electrochemical cell of the lead-acid recombinant type, which incorporates a separator comprising a sheet of entangled glass fibres, the improvement wherein the overall solubility of the fibres is greater than 3% by weight in 5 hours at 85° C. in sulphuric acid of specific gravity 1.200 and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 13
Dependent Claim
65 words
In an electrochemical cell of the lead-acid recombinant type, which incorporates a separator comprising a sheet of entangled glass fibres, the improvement wherein the overall solubility of the fibres is greater than 3% by weight in 5 hours at 85° C. in sulphuric acid of specific gravity 1.200 and less than 50% by weight of the fibres have a diameter of less than 1 μm.
Claim 14
Dependent Claim
76 words
In an electrochemical cell of the lead-acid recombinant type, incorporating a separator comprising a sheet of entangled glass fibres, the improvement wherein less than 50% of the fibres have a diameter of less than 1 μm, and the separator has the property that the acid electrolyte will wick upwards at a rate corresponding to a height of 200 mm in 60 minutes or less, and filling at least 90% of the pore spaces in the separator.
Claim 15
Dependent Claim
76 words
In an electrochemical cell of the lead-acid recombinant type, incorporating a separator comprising a sheet of entangled glass fibres, the improvement wherein less than 50% of the fibres have a diameter of less than 1 μm, and the separator has the property that the acid electrolyte will wick upwards at a rate corresponding to a height of 200 mm in 60 minutes or less, and filling at least 90% of the pore spaces in the separator.
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |