US2432448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching polyacrylonitrile
Assignee: EIDP Inc
•
Filing: 1945-01-10
•
Granted: 1947-12-09
•
Expires: 1965-01-10
Abstract
No abstract record available.
Inventors
- 👤 Richards John Cadwallader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10; D06L4/20; D06L4/22; D06L4/23; Y; Y10; Y10S; Y10S260/00; Y10S260/28; Y10S8/00; Y10S8/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2021763A
Cited
GB437271A
Cited
FR802840A
Cited
US2116210A
Cited
US2292737A
Cited
US2295660A
Cited
GB518970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-08 | 1951-06-09 | 1951-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-08 | 1955-06-09 | 1955-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-08 | 1959-06-09 | 1959-12-09 | $7700.00 | Window Closed / Lapsed |