US2786233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making battery separators
Assignee: WR Grace and Co
•
Filing: 1953-01-12
•
Granted: 1957-03-26
•
Expires: 1973-01-12
Abstract
No abstract record available.
Inventors
- 👤 Merrill Edward Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29D; B29D99/00; B29D99/006; H; H01; H01M; H01M50/00; H01M50/40; H01M50/403; H01M50/409; H01M50/411; B29L; B29L2031/00; B29L2031/712; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1159812A
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US1784906A
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US1954635A
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US1967726A
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US1920109A
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US2041356A
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US2303554A
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US2497212A
Cited
US2532080A
Cited
US2526318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |