US3487609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for filtering a gaseous medium
Assignee: CARTER-DAY COMPANY A MINNESOTA CORP
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Filing: 1968-02-29
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Granted: 1970-01-06
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Expires: 1988-02-29
Abstract
No abstract record available.
Inventors
- 👤 Knowlton J Caplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0039; B01D46/0041; B01D46/0046; B01D46/42; B01D46/4272; B01D46/66; B01D46/70; B01D46/71; B01D46/715; B01D46/90; B01D50/00; B01D50/20; F; F15; F15B; F15B21/00; F15B21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2468603A
Cited
US2804168A
Cited
US2848112A
Cited
US2862622A
Cited
US3073097A
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US3178868A
Cited
US3158455A
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US2962120A
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US3053031A
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US2974748A
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US3064619A
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US3097936A
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US3243940A
Cited
US3241297A
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GB974144A
Cited
GB990587A
Cited
US3256679A
Cited
US3212237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |