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Patent US3019535A successfully refreshed from Google Patents.
US3019535A
Expired / Lapsed
US
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Apparatus for removing matter from the bottom of waterways
Assignee: Individual
•
Filing: 1960-07-25
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Granted: 1962-02-06
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Expires: 1980-07-25
Abstract
No abstract record available.
Inventors
- 👤 David R Talbott
- 👤 William M Darden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:03
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189013591A
Cited
US95213A
Cited
DE573212C
Cited
GB189730404A
Cited
GB673627A
Cited
US2852868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |