Patent US2807321A successfully refreshed from Google Patents.
US2807321A
Expired / Lapsed
US
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Feeding means for evaporators
Assignee: Bayer AG
•
Filing: 1953-10-06
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Granted: 1957-09-24
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Expires: 1973-10-06
Abstract
No abstract record available.
Inventors
- 👤 Schneider Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:32
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; B01D1/223; B01D1/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1284074A
Cited
US1365055A
Cited
GB242883A
Cited
US2040837A
Cited
US2546381A
Cited
US2606146A
Cited
US2562153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |