US4113476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating low antimony alloy battery grid material with phosphorus
Assignee: General Battery Corp
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Filing: 1976-10-20
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Granted: 1978-09-12
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Expires: 1996-10-20
Abstract
Abstract A novel method is provided wherein the grain structure and castability of low antimony lead battery grid alloy is improved by treating that alloy with trace amounts of phosphorus, and more particularly red phosphorus.
Inventors
- 👤 John Nees
- 👤 Kenneth Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:13
CPC Classifications
C; C22; C22C; C22C11/00; C22C11/08; C22C11/10; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/68; H01M4/685; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S164/00; Y10S164/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A method of treating a low-antimony battery grid lead alloy prior to casting comprising the steps of: (a) bringing said alloy into a molten state; and (b) adding between 0.001 to 0.010 wt-% of phosphorus to said molten alloy, said alloy comprising between 2.25 and 2.75% antimony, between 0.25 and 0.50 wt-% tin, between 0.04 and 0.06 wt-% copper, between 0.003 and 0.01 wt-% sulfur, and a maximum of 0.15% arsenic.
Claim 2
Independent Claim
71 words
A method of treating a low-antimony battery grid lead alloy prior to casting comprising the steps of: (a) bringing said alloy into a molten state; and (b) adding between 0.001 to 0.010 wt-% of phosphorus to said molten alloy, said alloy comprising between 2.25 and 2.75% antimony, between 0.25 and 0.50 wt-% tin, between 0.04 and 0.06 wt-% copper, between 0.003 and 0.01 wt-% sulfur, and a maximum of 0.15% arsenic.
Claim 3
Independent Claim
112 words
A method of increasing the castability of low-antimony battery grid alloy and for refining the grain structure of and increasing the resistance to cracking of battery grids cast therefrom, comprising the steps of: (a) bringing a 50 ton kettle of 2.25 to 2.75 wt-% antimony-containing lead alloy into the molten state, said alloy further comprising between 0.25 and 0.50 wt-% tin, between 0.04 and 0.06 wt-% copper, between 0.003 and 0.01 wt-% sulfur, and a maximum of 0.15% arsenic; and (b) introducing between 1 and 5 pounds of phosphorus into said kettle over the surface of said alloy to treat said alloy prior to using said alloy to cast said battery grids.
Claim 4
Independent Claim
112 words
A method of increasing the castability of low-antimony battery grid alloy and for refining the grain structure of and increasing the resistance to cracking of battery grids cast therefrom, comprising the steps of: (a) bringing a 50 ton kettle of 2.25 to 2.75 wt-% antimony-containing lead alloy into the molten state, said alloy further comprising between 0.25 and 0.50 wt-% tin, between 0.04 and 0.06 wt-% copper, between 0.003 and 0.01 wt-% sulfur, and a maximum of 0.15% arsenic; and (b) introducing between 1 and 5 pounds of phosphorus into said kettle over the surface of said alloy to treat said alloy prior to using said alloy to cast said battery grids.
Claim 5
Dependent Claim
19 words
The invention of claim 2 wherein the weight of phosphorus added to said molten material is approximately 5 pounds.
Claim 6
Dependent Claim
11 words
The invention of claim 2 wherein said phosphorus is red phosphorus.
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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |