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Patent US3503401A successfully refreshed from Google Patents.
US3503401A
Expired / Lapsed
US
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Drainage control system
Assignee: HW Andersen Products Inc
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Filing: 1968-08-27
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Granted: 1970-03-31
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 Harold W Andersen
- 👤 Charles H Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/70
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) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |