US1715252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas and liquid contact apparatus
Assignee: Beazer East Inc
•
Filing: 1921-12-08
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Granted: 1929-05-28
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Expires: 1941-12-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick W Sperr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; Y; Y10; Y10S; Y10S164/00; Y10S164/01; Y10S261/00; Y10S261/72
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) | 1932-05-27 | 1932-11-26 | 1933-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-05-27 | 1936-11-26 | 1937-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-05-27 | 1940-11-26 | 1941-05-28 | $7700.00 | Window Closed / Lapsed |