Patent US1774581A successfully refreshed from Google Patents.
US1774581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bubble-tower grid
Assignee: Individual
•
Filing: 1927-08-01
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Granted: 1930-09-02
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Expires: 1947-08-01
Abstract
No abstract record available.
Inventors
- 👤 Louis E Winkler
- 👤 Fred C Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:11
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20; B01D3/205
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) | 1933-09-01 | 1934-03-03 | 1934-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-09-01 | 1938-03-03 | 1938-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-09-01 | 1942-03-03 | 1942-09-02 | $7700.00 | Window Closed / Lapsed |