US3709459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mould for casting electrode grids for electric storage batteries
Assignee: Electric Power Storage Ltd
•
Filing: 1970-11-19
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Granted: 1973-01-09
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Expires: 1990-11-19
Abstract
Abstract A mould for casting lead or lead alloy electrode grids for electric storage batteries comprises backing plates of metal faced with inserts of silicon nitride exposed to the melt.
Inventors
- 👤 C Bushrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
B; B22; B22C; B22C3/00; B22D; B22D25/00; B22D25/02; B22D25/04; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/82; H01M4/84; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
A mould as claimed in claim 1 in which the backing plates are of cast iron.
Claim 2
Dependent Claim
26 words
A mould as claimed in claim 1 which includes a layer of metal foil, of high conductivity, between the silicon nitride inserts and the backing plates.
Claim 3
Dependent Claim
15 words
A mould as claimed in claim 3 in which the metal foil is copper foil.
Claim 4
Dependent Claim
20 words
A mould as claimed in claim 1 which includes asbestos paper between the silicon nitride inserts and the backing plates.
Claim 5
Dependent Claim
20 words
A mould as claimed in claim 2 which includes asbestos paper between the silicon nitride inserts and the backing plates.
Claim 6
Dependent Claim
20 words
A mould as claimed in claim 3 which includes asbestos paper between the silicon nitride inserts and the backing plates.
Claim 7
Dependent Claim
20 words
A mould as claimed in claim 4 which includes asbestos paper between the silicon nitride inserts and the backing plates.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |