US2985308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element and system
Assignee: Infilco Inc
•
Filing: 1958-01-06
•
Granted: 1961-05-23
•
Expires: 1978-01-06
Abstract
No abstract record available.
Inventors
- 👤 Robert J Koupal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/27; B01D29/50; B01D29/52; B01D29/62; B01D29/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1352961A
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US1585246A
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US2041763A
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US2044096A
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US2100951A
Cited
US2423172A
Cited
US2570131A
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US2792943A
Cited
US2760644A
Cited
US2851164A
Cited
US2878938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |