US4356046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a battery separator using tubing
Assignee: Carl Freudenberg KG
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Filing: 1980-09-17
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Granted: 1982-10-26
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Expires: 2000-09-17
Abstract
Abstract To manufacture a tubular battery separator with a closed end, a tubular body is formed from a sheet of a separator material with a preponderant content of stretched thermoplastic fibers; the overlapping edges which occur welded together; a disc fitted to the inside diameter inserted from one end into the tubular body to a position near the other end leaving an overhanging edge; the overhanging edge softened by heating, causing it to shrink; and the softened and shrunk edge pressed against the disc so as to join the disc to the tubular body.
Inventors
- 👤 Hiroaki Yamazaki
- 👤 Takao Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:07
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/66; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/4329; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/61; B29C66/70; B29C66/72; B29C66/729; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; B29C69/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/463; H01M50/469; B29C48/00; B29C48/001; B29C48/0018; B29C48/03; B29C48/09; B29C48/13; B29C53/00; B29C53/56; B29C53/58; B29C57/00; B29C66/71; B29C66/7294; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A method for the manufacture of a tubular battery separator with a closed end, comprising: forming a tubular body from a sheet of a separator material with a preponderant content of stretched thermoplastic fibers, such that in forming said tubular body overlapping edges of said sheet occur; welding the overlapping edges which occur together; inserting a disc fitted to the inside diameter from one end into said tubular body to a position near the other end leaving an overhanging edge; softening the overhanging edge by heating, causing it to shrink; and pressing said softened and shrunk edge against the disc so as to join the disc to the tubular body.
Claim 2
Independent Claim
110 words
A method for the manufacture of a tubular battery separator with a closed end, comprising: forming a tubular body from a sheet of a separator material with a preponderant content of stretched thermoplastic fibers, such that in forming said tubular body overlapping edges of said sheet occur; welding the overlapping edges which occur together; inserting a disc fitted to the inside diameter from one end into said tubular body to a position near the other end leaving an overhanging edge; softening the overhanging edge by heating, causing it to shrink; and pressing said softened and shrunk edge against the disc so as to join the disc to the tubular body.
Claim 3
Dependent Claim
16 words
The method according to claim 1 comprising forming said tubular body by helically winding said sheet.
Claim 4
Dependent Claim
20 words
The method according to claim 1 comprising forming said tubular body by rolling said material parallel to a longitudinal edge.
Claim 5
Independent Claim
20 words
The method according to one of claims 1, 2 or 3 wherein said separator material is composed of polypropylene fibers.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |