Patent US2579589A successfully refreshed from Google Patents.
US2579589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery separator
Assignee: American Felt Co
•
Filing: 1947-02-25
•
Granted: 1951-12-25
•
Expires: 1967-02-25
Abstract
No abstract record available.
Inventors
- 👤 William H Lehmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:57
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: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US533751A
Cited
US1020149A
Cited
US1744256A
Cited
US1906342A
Cited
US1981736A
Cited
GB473194A
Cited
US2278896A
Cited
US2335757A
Cited
US2298274A
Cited
US2306781A
Cited
US2430868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |