US3638637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray humidifier
Assignee: LEWBILL IND Inc
•
Filing: 1970-05-21
•
Granted: 1972-02-01
•
Expires: 1990-05-21
Abstract
Abstract A normally closed solenoid valve connects a source of water under pressure to the spray nozzle of a humidifier. An electric switch is connected with the solenoid for energizing it to open the valve. This switch is actuated between on and off positions by means of a normally inactive timer that includes means for holding the switch in each of its positions a predetermined length of time. The timer is provided with means for connecting it in the fan circuit of a forced warm air furnace so that the timer will operate whenever the fan is running.
Inventors
- 👤 William H Coffman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:00
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A humidifier suitable for use with a forced warm air furnace, comprising a spray nozzle, a normally closed solenoid valve connected with the nozzle, means for connecting the valve with a source of water under pressure, an electric circuit for connecting the solenoid of said valve with the intermittently operating circuit of an air circulating fan, an electric control switch in said solenoid circuit provided with a pair of fixed contacts and with movable contact means engageable with either of the fixed contacts and normally engaging one of them, a manually operable switch in said circuit for electrically connecting either of said fixed contacts with said valve solenoid, and a timer for actuating said control switch and including means for holding said movable contact means in engagement with one of said fixed contacts longer than with the other.
Claim 2
Dependent Claim
138 words
A humidifier suitable for use with a forced warm air furnace, comprising a spray nozzle, a normally closed solenoid valve connected with the nozzle, means for connecting the valve with a source of water under pressure, an electric circuit for connecting the solenoid of said valve with the intermittently operating circuit of an air circulating fan, an electric control switch in said solenoid circuit provided with a pair of fixed contacts and with movable contact means engageable with either of the fixed contacts and normally engaging one of them, a manually operable switch in said circuit for electrically connecting either of said fixed contacts with said valve solenoid, and a timer for actuating said control switch and including means for holding said movable contact means in engagement with one of said fixed contacts longer than with the other.
Claim 3
Dependent Claim
40 words
A humidifier according to claim 1, in which said timer means is a rotating cam shaped to hold said movable contact means in engagement with one of said fixed contacts substantially twice as long as with the other fixed contact.
Claim 4
Dependent Claim
49 words
A humidifier according to claim 1, in which said timer means is a rotating cam, and said control switch includes means engaged by the rotating cam for periodically moving said movable contact means out of engagement with said one fixed contact and into engagement with the other fixed contact.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |