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Patent US2928494A successfully refreshed from Google Patents.
US2928494A
Expired / Lapsed
US
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Apparatus for treating air
Assignee: Pillsbury Co
•
Filing: 1958-11-19
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Granted: 1960-03-15
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Expires: 1978-11-19
Abstract
No abstract record available.
Inventors
- 👤 Powell F Sams
- 👤 Robert L Teders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:27
CPC Classifications
B; B01; B01D; B01D50/00; C; C12; C12M; C12M37/00; C12M37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |