US2843269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Center tubes for filters
Assignee: Purolator Products Inc
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Filing: 1955-05-16
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Granted: 1958-07-15
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Dudinec Emery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:01
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B21C37/156; B21C37/157; B01D2201/00; B01D2201/04; B01D2201/0415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |