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US2837215A
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Assignee: Knowles Associates
•
Filing: 1954-05-21
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Granted: 1958-06-03
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Expires: 1974-05-21
Abstract
No abstract record available.
Inventors
- 👤 Chelminski Roman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:19
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/02; B01D21/04; B01D21/06; B01D21/18; B01D21/20; B01D21/22; B01D21/24; B01D21/2405; B01D21/2427; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1888743A
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US2360817A
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US2596363A
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US2566988A
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US2588115A
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US2585006A
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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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |