US3426901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical dispersion device for swimming pools
Assignee: Individual
•
Filing: 1968-01-15
•
Granted: 1969-02-11
•
Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 David Sherper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688; B; B01; B01F; B01F21/00; B01F21/20; B01F21/22; C02F2103/00; C02F2103/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2135932A
Cited
US2142947A
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US2553977A
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US2579304A
Cited
US2820701A
Cited
US2758877A
Cited
US2934409A
Cited
US3107156A
Cited
US3129172A
Cited
US3094134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |