US2816665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound filter element
Assignee: Purolator Products Inc
•
Filing: 1954-08-16
•
Granted: 1957-12-17
•
Expires: 1974-08-16
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Layte
- 👤 Wolk Reuben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/001; B01D25/22; B01D25/24; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/44; B01D29/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US15363A
Cited
GB191109228A
Cited
US1639133A
Cited
US1792797A
Cited
US1965172A
Cited
US2141903A
Cited
US2339703A
Cited
GB579562A
Cited
US2599604A
Cited
FR1050918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |