Patent FR2749558A1 successfully refreshed from Google Patents.
US1619807A
Expired / Lapsed
US
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Treatment of pulps
Assignee: Dorr Co
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Filing: 1923-04-18
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Granted: 1927-03-08
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Expires: 1943-04-18
Abstract
No abstract record available.
Inventors
- 👤 Blomfield Alfred Leslie
- 👤 Ramsey Elmer Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/18; B02C17/183; B02C17/1835; B02C17/184
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) | 1930-03-07 | 1930-09-06 | 1931-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-03-07 | 1934-09-06 | 1935-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-03-07 | 1938-09-06 | 1939-03-08 | $7700.00 | Window Closed / Lapsed |