US2242372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making porous articles
Assignee: Celanese Corp
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Filing: 1938-07-26
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Granted: 1941-05-20
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Expires: 1958-07-26
Abstract
No abstract record available.
Inventors
- 👤 Schneider George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:05
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D39/00; B01D39/14; B01D39/16; B01D39/18; C; C08; C08J; C08J9/00; C08L; C08L1/00; C08L1/08; C08J2301/00; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10S264/61; Y10S264/62; Y10S264/63
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) | 1944-05-19 | 1944-11-18 | 1945-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-19 | 1948-11-18 | 1949-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-19 | 1952-11-18 | 1953-05-20 | $7700.00 | Window Closed / Lapsed |