US3504422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a depth-type filter media
Assignee: Bell Aerospace Corp
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Filing: 1968-01-19
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Granted: 1970-04-07
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 George R Thalman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:32
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2041; B01D39/2044; B22; B22F; B22F3/00; B22F3/002; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49801
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2520124A
Cited
US3098723A
Cited
FR1318752A
Cited
FR1341685A
Cited
US3310387A
Cited
US3443301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |