US3512540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cleaning swimming pools
Assignee: WAYNE L HUGHES
•
Filing: 1968-05-27
•
Granted: 1970-05-19
•
Expires: 1988-05-27
Abstract
No abstract record available.
Inventors
- 👤 Wayne L Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:57
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/14; E04H4/16; E04H4/1681
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2812960A
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US3032044A
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US3074078A
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US3146783A
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US3168896A
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US3289216A
Cited
US3372948A
Cited
US3392738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |