US1264635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus and system.
Assignee: Individual
•
Filing: 1917-09-25
•
Granted: 1918-04-30
•
Expires: 1937-09-25
Abstract
No abstract record available.
Inventors
- 👤 Walton C Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:52
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/23; B01D33/58; B01D33/68
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) | 1921-04-29 | 1921-10-29 | 1922-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-04-29 | 1925-10-29 | 1926-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-04-29 | 1929-10-29 | 1930-04-30 | $7700.00 | Window Closed / Lapsed |