US1847263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for treating waste paper
Assignee: Waldorf Paper Products Co
•
Filing: 1929-02-07
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Granted: 1932-03-01
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Expires: 1949-02-07
Abstract
No abstract record available.
Inventors
- 👤 Nels H Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:51
CPC Classifications
D; D21; D21G; D21G9/00; Y; Y10; Y10S; Y10S209/00; Y10S209/93
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) | 1935-03-01 | 1935-08-31 | 1936-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-01 | 1939-08-31 | 1940-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-01 | 1943-08-31 | 1944-03-01 | $7700.00 | Window Closed / Lapsed |