US2231891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing natural or artificial fibers having dyeing properties resembling those of wool and products obtained thereby
Assignee: WALTHER H DUISBERG
•
Filing: 1938-12-07
•
Granted: 1941-02-18
•
Expires: 1958-12-07
Abstract
No abstract record available.
Inventors
- 👤 Paul Esselmann
- 👤 Josef Düsing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/5207; D06P1/5214; D06P1/5242; D06F; D06F71/00; D06F71/02; D06F71/023; D06P1/64; D06P1/642; D06P1/6424; D06P5/00; D06P5/22; D06P5/225; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/2971
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1944-02-18 | 1944-08-19 | 1945-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-18 | 1948-08-19 | 1949-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-18 | 1952-08-19 | 1953-02-18 | $7700.00 | Window Closed / Lapsed |