US2554343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anisometric metallic filter
Assignee: Individual
•
Filing: 1947-07-22
•
Granted: 1951-05-22
•
Expires: 1967-07-22
Abstract
No abstract record available.
Inventors
- 👤 Pall David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:17
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1819927A
Cited
US2027963A
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US2149596A
Cited
US2219423A
Cited
US2350179A
Cited
US2368458A
Cited
US2437127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |