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US3531402A
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US
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Apparatus and method for regenerating a water softening system
Assignee: L AND A PRODUCTS Inc
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Filing: 1969-01-17
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Granted: 1970-09-29
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Expires: 1989-01-17
Abstract
No abstract record available.
Inventors
- 👤 Richard G Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:46
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/80; B01J49/85
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1654537A
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US1976439A
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US2338667A
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US3021276A
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US3080974A
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US3342336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |