US1957941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Density controlling apparatus
Assignee: Individual
•
Filing: 1932-11-16
•
Granted: 1934-05-08
•
Expires: 1952-11-16
Abstract
No abstract record available.
Inventors
- 👤 Harrison S Coe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/025; F04B43/026; F04B43/028; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2504
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) | 1937-05-07 | 1937-11-06 | 1938-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-05-07 | 1941-11-06 | 1942-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-05-07 | 1945-11-06 | 1946-05-08 | $7700.00 | Window Closed / Lapsed |