US3279614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and center tube
Assignee: STONE FILTER CORP
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Filing: 1963-08-27
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Granted: 1966-10-18
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Expires: 1983-08-27
Abstract
No abstract record available.
Inventors
- 👤 Southwick W Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
A FILTER CENTER TUBE CONTAINING A PLURALITY OF PERIPHERAL OPENINGS ALONG ITS LENGTH, SAID OPENINGS LYING PREDOMINANTLY WITHIN A SECTOR OF FROM 75* TO 120*, SAID TUBE BEING CIRCUMFERENTIALLY GROOVED DEFINING WALL PORTIONS OF REDUCED THICKNESS CONTAINING SAID OPENINGS.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |