US3516544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater aquarium filter
Assignee: Sternco Industries Inc
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Filing: 1968-10-25
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Granted: 1970-06-23
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Expires: 1988-10-25
Abstract
No abstract record available.
Inventors
- 👤 Walter Sesholtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:56
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/045; B; B01; B01D; B01D24/00; B01D24/002; B01D24/02; B01D24/10; B01D24/12; B01D24/38; B01D24/42; B01D2201/00; B01D2201/04; B01D2201/0415; B01D2201/0423; B01D2201/20; B01D2201/204
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) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |