US1720670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of ultrafilter membranes
Assignee: Individual
•
Filing: 1923-08-30
•
Granted: 1929-07-16
•
Expires: 1943-08-30
Abstract
No abstract record available.
Inventors
- 👤 Duclaux Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/106; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/22; Y; Y10; Y10S; Y10S55/00; Y10S55/24
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) | 1932-07-15 | 1933-01-14 | 1933-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-07-15 | 1937-01-14 | 1937-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-07-15 | 1941-01-14 | 1941-07-16 | $7700.00 | Window Closed / Lapsed |