US1735455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for fractional condensation
Assignee: Barrett Co Inc
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Filing: 1921-02-12
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Granted: 1929-11-12
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Expires: 1941-02-12
Abstract
No abstract record available.
Inventors
- 👤 Frank D Fenhagen
- 👤 Frederick H Rhodes
- 👤 Theodore M Hesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
B; B01; B01D; B01D5/00; B01D5/0003; B01D5/0024; B01D5/0033; B01D5/0036; B01D5/0078; B01D5/0096
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) | 1932-11-11 | 1933-05-13 | 1933-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-11-11 | 1937-05-13 | 1937-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-11-11 | 1941-05-13 | 1941-11-12 | $7700.00 | Window Closed / Lapsed |