US4071946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lead powder for tube electrodes
Assignee: Tudor AB
•
Filing: 1976-12-17
•
Granted: 1978-02-07
•
Expires: 1996-12-17
Abstract
Abstract An improvement in the preparation of dry lead powder mixtures for the production of tube electrodes for lead storage batteries to reduce the dust binding problem during filling of the tube electrodes is disclosed. A small amount (0.1 to 3 weight percent) of polytetrafluoroethylene (PTFE) is mixed with the lead powder, the mixture is heated and shear stresses are applied thereto sufficient to convert substantially all of the PTFE in the mixture to fibrous form. The resulting mixture can be utilized in a dry powder process for the filling of tube electrodes with a substantial reduction or elimination of the dust binding problem.
Inventors
- 👤 Ove Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:16
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/56; H01M4/57; H01M4/14; H01M4/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
In a process for the production of tube electrodes for use in lead storage batteries wherein a sheath is provided about a conductive rod and a dry lead powder is introduced between the sheath and the rod, the improvement which comprises making the lead powder by forming a mixture of lead powder which normally is at least 70% oxidized and from 0.1 to 3 percent by weight of polytetrafluoroethylene, heating the mixture and applying shear stresses to said powder mixture sufficient to convert a substantial portion of said polytetrofluoroethylene into fibrous form.
Claim 2
Dependent Claim
92 words
In a process for the production of tube electrodes for use in lead storage batteries wherein a sheath is provided about a conductive rod and a dry lead powder is introduced between the sheath and the rod, the improvement which comprises making the lead powder by forming a mixture of lead powder which normally is at least 70% oxidized and from 0.1 to 3 percent by weight of polytetrafluoroethylene, heating the mixture and applying shear stresses to said powder mixture sufficient to convert a substantial portion of said polytetrofluoroethylene into fibrous form.
Claim 3
Dependent Claim
18 words
In the process of claim 1 wherein the amount of polytetrafluoroethylene is 0.2 to 0.5 percent by weight.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |