US2440416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum rotary drum drier having means to compress evacuated vapors
Assignee: ALVAN A PROUDFOOT
•
Filing: 1945-03-03
•
Granted: 1948-04-27
•
Expires: 1965-03-03
Abstract
No abstract record available.
Inventors
- 👤 Charles B Proudfoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:12
CPC Classifications
D; D06; D06F; D06F58/00; D06F58/20; D06F58/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US76591A
Cited
US1160109A
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US1060801A
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US1501513A
Cited
US1391510A
Cited
US1425005A
Cited
US1530439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |