US2529389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making wood separators for lead-acid electric accumulators
Assignee: Exide Technologies LLC
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Filing: 1947-01-25
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Granted: 1950-11-07
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Expires: 1967-01-25
Abstract
No abstract record available.
Inventors
- 👤 Hampton Harold John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/429; H01M50/4295; H01M50/44; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF PROCESSING DRIED, ALKALI-TREATED WOOD SEPARATORS FOR LEAD-ACID ELECTRIC ACCUMULATORS COMPRISING THE STEPS OF IMMERSING THE SEPARATORS IN AN AQUEOUS SOLUTION OF SODIUM SILICATE OF ABOUT 1.04 SPECIFIC GRAVITY AT A TEMPERATURE NEAR THE BOILING POINT OF THE SOLUTION, DRYING THE SEPARATORS, IMMERSING THE SEPARATORS IN A SOLUTION OF ABOUT 3 PERCENT POLYVINYL CHLORIDE IN CYCLOHEXANONE FOR 2 TO 3 HOURS, THE AMOUNT OF SAID POLYVINYL CHLORIDE BEING INSUFFICIENT TO ENCASE COMPLETELY THE FIBERS OF SAID SEPARATORS, DRYING THE SEPARATORS, IMMERSING THE SEPARATORS IN A 3 PERCENT AQUEOUS SOLUTION OF SULFONATED OIL WETTYING AGENT AT A TEMPERATURE OF ABOUT 60*C., AND DRYING AT A TEMPERATURE UP TO 140*C.
Claim 2
Independent Claim
110 words
A METHOD OF PROCESSING DRIED, ALKALI-TREATED WOOD SEPARATORS FOR LEAD-ACID ELECTRIC ACCUMULATORS COMPRISING THE STEPS OF IMMERSING THE SEPARATORS IN AN AQUEOUS SOLUTION OF SODIUM SILICATE OF ABOUT 1.04 SPECIFIC GRAVITY AT A TEMPERATURE NEAR THE BOILING POINT OF THE SOLUTION, DRYING THE SEPARATORS, IMMERSING THE SEPARATORS IN A SOLUTION OF ABOUT 3 PERCENT POLYVINYL CHLORIDE IN CYCLOHEXANONE FOR 2 TO 3 HOURS, THE AMOUNT OF SAID POLYVINYL CHLORIDE BEING INSUFFICIENT TO ENCASE COMPLETELY THE FIBERS OF SAID SEPARATORS, DRYING THE SEPARATORS, IMMERSING THE SEPARATORS IN A 3 PERCENT AQUEOUS SOLUTION OF SULFONATED OIL WETTYING AGENT AT A TEMPERATURE OF ABOUT 60*C., AND DRYING AT A TEMPERATURE UP TO 140*C.
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) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |