Patent US2256483A successfully refreshed from Google Patents.
US2256483A
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US
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Synthetic spongy material
Assignee: EIDP Inc
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Filing: 1939-06-21
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Granted: 1941-09-23
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Expires: 1959-06-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10S264/00; Y10S264/13; Y10S264/14; Y10S36/00; Y10S36/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-22 | 1945-03-24 | 1945-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-22 | 1949-03-24 | 1949-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-22 | 1953-03-24 | 1953-09-23 | $7700.00 | Window Closed / Lapsed |