Patent US3405807A successfully refreshed from Google Patents.
US3405807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge sealing means
Assignee: Union Tank Car Co
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Filing: 1967-06-08
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Granted: 1968-10-15
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Expires: 1987-06-08
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Burkhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:58
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D29/88; B01D29/90; B01D29/902; B01D29/96; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0438; B01D2201/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2440487A
Cited
US2507125A
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US2919030A
Cited
US2921686A
Cited
US3186042A
Cited
US3279608A
Cited
US3304104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |