US3537113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drain-cleaning device
Assignee: WOODROW M ELZNER
•
Filing: 1968-09-23
•
Granted: 1970-11-03
•
Expires: 1988-09-23
Abstract
No abstract record available.
Inventors
- 👤 Woodrow M Elzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/12; E03C1/30; E03C1/304; E03C1/308
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733450A
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US672164A
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GB191127115A
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US1196414A
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CH78235A
Cited
US1361972A
Cited
US1941065A
Cited
US1937172A
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US2086149A
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US2312826A
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CH260243A
Cited
US2697842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |