US3528545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorine residual controlling system
Assignee: SPX Technologies Inc
•
Filing: 1968-08-23
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Granted: 1970-09-15
•
Expires: 1988-08-23
Abstract
No abstract record available.
Inventors
- 👤 Wilbur H Frazel
- 👤 Quentin C Turtle
- 👤 Thomas Yip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:04
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |