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US3021954A
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Assignee: HOFFMAN ALLEN CORP
•
Filing: 1958-11-24
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Granted: 1962-02-20
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Expires: 1978-11-24
Abstract
No abstract record available.
Inventors
- 👤 Albert S Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:42
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D24/00; B01D24/002; B01D24/004; B01D24/02; B01D24/04; B01D24/08; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D29/54; B01D29/56; B01D36/00; B01D36/02; Y; Y10; Y10S; Y10S210/00; Y10S210/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1906418A
Cited
GB390889A
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US2098725A
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US2253686A
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US2422647A
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US2507125A
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US2633245A
Cited
US2605904A
Cited
US2545374A
Cited
US2743018A
Cited
US2843268A
Cited
US2979160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |