Patent US1806309A successfully refreshed from Google Patents.
US1806309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of pulp and product of same
Assignee: Brown Co
•
Filing: 1927-08-05
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Granted: 1931-05-19
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Expires: 1947-08-05
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
- 👤 Milton O Schur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:04
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/08; 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) | 1934-05-18 | 1934-11-17 | 1935-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-05-18 | 1938-11-17 | 1939-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-05-18 | 1942-11-17 | 1943-05-19 | $7700.00 | Window Closed / Lapsed |