US2809020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaker
Assignee: Individual
•
Filing: 1954-04-09
•
Granted: 1957-10-08
•
Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Magee Joseph William
- 👤 Conrad Ivan Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:00
CPC Classifications
B; B01; B01F; B01F31/00; B01F31/20; B01F31/26; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US639404A
Cited
FR408786A
Cited
US1602196A
Cited
US1688665A
Cited
FR676940A
Cited
US1871374A
Cited
US2247978A
Cited
US2541043A
Cited
US2671191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |