US2687805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter structure
Assignee: Hilliard Corp
•
Filing: 1950-01-07
•
Granted: 1954-08-31
•
Expires: 1970-01-07
Abstract
No abstract record available.
Inventors
- 👤 Eugene H Proulx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:50
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D29/11; B01D29/13; B01D29/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2359475A
Cited
US2436108A
Cited
US2495095A
Cited
US2501582A
Cited
US2522502A
Cited
US2548584A
Cited
US2553820A
Cited
US2604994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |