US3458977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filters
Assignee: Dana Inc
•
Filing: 1964-05-19
•
Granted: 1969-08-05
•
Expires: 1984-05-19
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Young
- 👤 Kingsley E Humbert Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D25/00; B01D25/22; B01D25/26; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D46/10; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165; Y10T428/24174; Y10T428/24273; Y10T428/24298; Y10T428/24322; Y10T428/24331; Y10T428/24628; Y10T428/24669; Y10T428/24686
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
18 words
THE MEHOD OF MAKING A FILTER COMPRISING PROVIDING A PAIR OF SEPARATE FLAT END WALL PORTIONS COMPRISING SHEETS
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |