US3905153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic interior environment control
Assignee: Individual
•
Filing: 1974-01-09
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Granted: 1975-09-16
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Expires: 1994-01-09
Abstract
Abstract Apparatus for automatic control of environmental conditions in building interiors, particularly in greenhouses where exacting conditions of temperature must be met. The apparatus consists of electronic circuitry for sensing and providing output indication of temperature, incident solar radiation, daily solar radiation accumulation and nocturnal temperature modification, an executive set-point and an insecticide control set-point, all of which outputs are applied to a summation device whereupon level detection actuates control circuitry to activate heating and/or cooling apparatus, insecticide control apparatus and other attendant equipment.
Inventors
- 👤 William L Enter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:41
CPC Classifications
A; A01; A01G; A01G9/00; A01G9/24; G; G05; G05B; G05B11/00; G05B11/01; G05B11/32; G05D; G05D23/00; G05D23/19; G05D23/1902; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
A method of temperature control in greenhouses comprising the steps of: automatically controlling the temperature as sensed within a greenhouse through adjustment to a predetermined set-point; and further adjusting said set point during dark periods in proportion to the amount of sunlight sensed during the preceding daylight period.
Claim 2
Independent Claim
48 words
A method of temperature control in greenhouses comprising the steps of: automatically controlling the temperature as sensed within a greenhouse through adjustment to a predetermined set-point; and further adjusting said set point during dark periods in proportion to the amount of sunlight sensed during the preceding daylight period.
Claim 3
Dependent Claim
34 words
A method as set forth in claim 1 which is further characterized to include the step of: further adjusting said set-point in proportion to the amount of sunlight sensed instantaneously during the daylight periods.
Claim 4
Dependent Claim
45 words
A method as set forth in claim 2 which is further characterized to include the step of: further adjusting said set-point in timed relationship during application of insecticide to increase the set-point during insecticide application and thereafter to decrease said set-point for a predetermined duration.
Claim 5
Dependent Claim
45 words
A method as set forth in claim 1 which is further characterized to include the step of: further adjusting said set-point in timed relationship during application of insecticide to increase the set-point during insecticide application and thereafter to decrease said set-point for a predetermined duration.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |