Patent US3499222A successfully refreshed from Google Patents.
Patent US1438587A successfully refreshed from Google Patents.
US1438587A
Expired / Lapsed
US
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Treatment of clay and product thereof
Assignee: Individual
•
Filing: 1920-10-12
•
Granted: 1922-12-12
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Expires: 1940-10-12
Abstract
No abstract record available.
Inventors
- 👤 Feldenheimer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:38
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; Y; Y10; Y10S; Y10S516/00; Y10S516/01
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) | 1925-12-11 | 1926-06-12 | 1926-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-12-11 | 1930-06-12 | 1930-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-12-11 | 1934-06-12 | 1934-12-12 | $7700.00 | Window Closed / Lapsed |