Patent US4265985A successfully refreshed from Google Patents.
US4265985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead acid battery with separator having long fibers
Assignee: Daramic LLC
•
Filing: 1980-05-23
•
Granted: 1981-05-05
•
Expires: 2000-05-23
Abstract
Abstract A battery separator is provided that has 30-70% polyolefin synthetic pulp, 15-65% siliceous filler and 1-35% by weight of long fibers having lengths of between 1/4 and 1 inch. The long fibers may be polyester fibers or glass fibers or a mixture. Cellulose may be included in an amount up to about 10%. A process for forming the battery separator is also revealed using standard paper making equipment but employing ionic copolymers containing acrylamide in cationic and anionic combination to give good affinity of the siliceous material and polyolefin. Alum and other processing aids are also included as are other procedural steps such as pressing the web.
Inventors
- 👤 Dennis D. O'Rell
- 👤 Nigel I. Palmer
- 👤 Vu H. Nguyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:44
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H13/00; D21H13/36; D21H13/38; D21H13/40; D21H13/10; D21H13/20; D21H13/24; H; H01; H01M; H01M50/00; H01M50/40; H01M50/403; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/42; H01M50/429; H01M50/44; H01M50/489; H01M2300/00; H01M2300/0002; H01M2300/0005; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A lead acid battery with a positive plate, a negative plate, a battery separator therebetween, and an electrolyte said battery separator comprised of about 30 to about 70 weight percent of a fiberous polyolefin synthetic pulp, about 15 to about 65 weight percent of a particulate siliceous filler having a particle size of about 0.01 to about 20 microns and about 1 to about 35 weight percent of long fiber having a length of at least about 0.25 inches and chosen from the group consisting of polyester paper making staple fibers having a denier of about 1.5 to about 12, acrylic paper making staple fibers having a denier of about 1.5 to about 12 and glass fibers having a diameter of about 1 to about 7 microns and mixtures thereof.
Claim 2
Dependent Claim
130 words
A lead acid battery with a positive plate, a negative plate, a battery separator therebetween, and an electrolyte said battery separator comprised of about 30 to about 70 weight percent of a fiberous polyolefin synthetic pulp, about 15 to about 65 weight percent of a particulate siliceous filler having a particle size of about 0.01 to about 20 microns and about 1 to about 35 weight percent of long fiber having a length of at least about 0.25 inches and chosen from the group consisting of polyester paper making staple fibers having a denier of about 1.5 to about 12, acrylic paper making staple fibers having a denier of about 1.5 to about 12 and glass fibers having a diameter of about 1 to about 7 microns and mixtures thereof.
Claim 3
Dependent Claim
50 words
The lead acid battery of claim 1 wherein at least a portion of said long fibers are paper making staple fibers chosen from the group consisting of polyester fibers and acrylic fibers and at least some of the fibers of said polyolefin synthetic pulp are at least partially melt bonded.
Claim 4
Dependent Claim
53 words
The lead acid battery of claim 2 wherein at least 1 weight percent of said long paper making staple fiber is comprised of polyester, said synthetic pulp has an average fiber length of about 1 to about 4 millimeters and said battery separator comprising about 0.5 to about 10 weight percent cellulosic fiber.
Claim 5
Dependent Claim
92 words
A lead acid battery comprising a positive plate, a negative plate, a battery separator therebetween, and an electrolyte said battery separator comprising about 30 to about 70 weight percent of a fiberous polyolefin synthetic pulp, about 15 to about 65 weight percent of a particulate siliceous filler having a particle size of about 0.01 to about 20 microns and about 1 to about 35 weight percent of long fibers having lengths of at least about 0.25 inches and selected from the group consisting of polyester, acrylic, and glass fibers and mixtures thereof.
Claim 6
Dependent Claim
92 words
A lead acid battery comprising a positive plate, a negative plate, a battery separator therebetween, and an electrolyte said battery separator comprising about 30 to about 70 weight percent of a fiberous polyolefin synthetic pulp, about 15 to about 65 weight percent of a particulate siliceous filler having a particle size of about 0.01 to about 20 microns and about 1 to about 35 weight percent of long fibers having lengths of at least about 0.25 inches and selected from the group consisting of polyester, acrylic, and glass fibers and mixtures thereof.
Claim 7
Dependent Claim
59 words
The lead acid battery of claim 4 wherein said long fibers have a substantially smooth surface and a denier in the range of about 1.5 to about 12 and said battery separator having at least some of said fiberous polyolefin synthetic pulp at least partially melt bonded and having a vacuum electrical resistance of less than 20 milliohoms·square inch.
References Cited (Backward Citations)
US2734095A
Cited
US3085126A
Cited
US3272657A
Cited
US3247025A
Cited
US3351495A
Cited
US3472700A
Cited
US3784413A
Cited
US3743272A
Cited
US3891499A
Cited
US3920508A
Cited
US3997648A
Cited
US3915750A
Cited
US3987139A
Cited
US4007247A
Cited
US3995001A
Cited
US3902957A
Cited
DE2509823A1
Cited
US4024323A
Cited
US4216280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |