US1860432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of lowering the solution viscosity of cellulose fiber
Assignee: Brown Co
•
Filing: 1928-08-22
•
Granted: 1932-05-31
•
Expires: 1948-08-22
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:20
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/001; D01; D01F; D01F2/00; D01F2/06; D01F2/08; Y; Y10; Y10S; Y10S162/00; Y10S162/05
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) | 1935-05-31 | 1935-11-30 | 1936-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-31 | 1939-11-30 | 1940-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-31 | 1943-11-30 | 1944-05-31 | $7700.00 | Window Closed / Lapsed |