US3428559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for treating swimming pool water
Assignee: Ballard & Associates Inc
•
Filing: 1966-10-14
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Granted: 1969-02-18
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Expires: 1986-10-14
Abstract
No abstract record available.
Inventors
- 👤 Andrew M Mcinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:58
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; E04H4/129; C; C02; C02F; C02F1/00; C02F1/02; C02F1/72; C02F1/76; C02F1/763; C02F5/00; C02F5/02; C02F2103/00; C02F2103/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US704043A
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US759607A
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US1964487A
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US2661333A
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US2597192A
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US2781635A
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US2921004A
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US2889902A
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US2937013A
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US3072134A
Cited
US3251357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |