US3865710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification control unit
Assignee: Camper and Nicholsons (Holdings) Ltd
•
Filing: 1973-02-26
•
Granted: 1975-02-11
•
Expires: 1993-02-26
Abstract
Abstract A control circuit, particularly for use in a water purification circuit, in which a multivibrator circuit is controlled to reverse periodically the d.c. polarity of output terminals of the circuit across which a water purification cell may be connected.
Inventors
- 👤 Richard John Phipps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:56
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; G; G01; G01N; G01N33/00; G01N33/18; C02F1/4606; C02F1/463; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4612; C02F2201/46125; C02F2201/4613; C02F2201/4615; C02F2201/4616; C02F2201/4617; C02F2301/00; C02F2301/08; Y; Y10; Y10S; Y10S204/00; Y10S204/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A water purification control circuit having a pair of supply terminals, first and second pairs of unidirectional output terminals, a network including controlled rectifiers and interconnecting said supply and output terminals for supplying to said first and second pairs of output terminals purification and coagulation currents respectively, a multivibrator circuit connected with said network, and circuit means controlling the operation of the multivibrator circuit, the arrangement being such that a change in state of the multivibrator circuit changes the conducting state of the controlled rectifiers to reverse the polarity of both pairs of the output terminals.
Claim 2
Dependent Claim
96 words
A water purification control circuit having a pair of supply terminals, first and second pairs of unidirectional output terminals, a network including controlled rectifiers and interconnecting said supply and output terminals for supplying to said first and second pairs of output terminals purification and coagulation currents respectively, a multivibrator circuit connected with said network, and circuit means controlling the operation of the multivibrator circuit, the arrangement being such that a change in state of the multivibrator circuit changes the conducting state of the controlled rectifiers to reverse the polarity of both pairs of the output terminals.
Claim 3
Dependent Claim
29 words
A control circuit is claimed in claim 1, including a water purification cell comprising at least one pair of silver electrodes connected across the first pair of output terminals.
Claim 4
Dependent Claim
32 words
A control circuit as claimed in claim 2, in which said multivibrator is a bistable multivibrator, and said circuit means includes a timing circuit whose output causes the multivibrator to change state.
Claim 5
Dependent Claim
62 words
A control circuit as claimed in claim 1, in which said network includes a pair of controlled rectifiers connected in parallel but with opposite polarity between one of the supply terminals and one of the first pair of output terminals, the state of the multivibrator determining which of the rectifiers may be made conductive, and thereby the polarity of the output terminals.
Claim 6
Dependent Claim
69 words
A control circuit as claimed in claim 4, in which said network includes a second pair of controlled rectifiers connected in parallel but with opposite polarity between one of the supply terminals and one of the second pair of output terminals, the state of the multivibrator determining which of the second pair of rectifiers may be made conductive, and thereby the polarity of the second pair of output terminals.
Claim 7
Dependent Claim
33 words
A control circuit as claimed in claim 5, in which said second pair of output terminals is connected across a pair of electrodes which serve to coagulate impurities in water between the electrodes.
Claim 8
Dependent Claim
31 words
A control circuit as claimed in claim 6, including a logic circuit conNected between the output of the multivibrator and the control electrodes of the rectifiers to control the conduction thereof.
Claim 9
Dependent Claim
26 words
A control circuit as claimed in claim 7, including means for varying the firing angle of the rectifiers to control thereby the output current or currents.
Claim 10
Dependent Claim
25 words
A control circuit as claimed in claim 6, in combination with a water flow path through said coagulating electrodes, a filter and said purification cell.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |