US2103572A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1936-07-22
•
Granted: 1937-12-28
•
Expires: 1956-07-22
Abstract
No abstract record available.
Inventors
- 👤 Donald H Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D29/11; B01D29/111; B01D29/39; B01D29/41; B01D35/00; B01D35/18; B01D39/00; B01D39/08; B01D39/083; B01D39/086; B01D39/14; B01D39/16; B01D39/18; B01D2239/00; B01D2239/04; B01D2239/0407; B01D2239/0464; B01D2239/0471; B01D2239/06; B01D2239/065; B01D2239/08; B01D37/00; B01D37/02
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) | 1940-12-27 | 1941-06-28 | 1941-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-12-27 | 1945-06-28 | 1945-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-12-27 | 1949-06-28 | 1949-12-28 | $7700.00 | Window Closed / Lapsed |