Patent US3380914A successfully refreshed from Google Patents.
US3380914A
Expired / Lapsed
US
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Selective absorption system
Assignee: Chesapeake Corp of Virginia
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Filing: 1965-08-23
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Granted: 1968-04-30
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Expires: 1985-08-23
Abstract
No abstract record available.
Inventors
- 👤 Vranian Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:47
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569695A
Cited
GB223495A
Cited
US1739834A
Cited
US1840164A
Cited
US2315372A
Cited
US3256997A
Cited
US3239452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |