US2552188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaker
Assignee: Individual
•
Filing: 1949-04-27
•
Granted: 1951-05-08
•
Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Krause Fred
- 👤 William N Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:40
CPC Classifications
B; B01; B01F; B01F31/00; B01F31/20; B01F31/26; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US22984A
Cited
US342336A
Cited
US383082A
Cited
US639404A
Cited
US654051A
Cited
US1330679A
Cited
US2067399A
Cited
US2345130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |