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US3424311A
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Assignee: FREDERICK M SIEDENBURG
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Filing: 1966-08-31
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Granted: 1969-01-28
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Expires: 1986-08-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick M Siedenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:56
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/0214; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7358; Y10T137/7381; Y10T137/7387; Y10T137/7391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US948725A
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US2313773A
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US924524A
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GB190919709A
Cited
US1907001A
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US2204998A
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US2467409A
Cited
US2936890A
Cited
US3339736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |