US2747331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroponics
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1952-07-02
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Granted: 1956-05-29
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Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Steiner Abram Arie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:16
CPC Classifications
A; A01; A01G; A01G31/00; A01G31/02; C; C05; C05D; C05D9/00; Y; Y02; Y02P; Y02P60/00; Y02P60/20; Y02P60/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN AN INSTALLATION FOR HYDROPONICS, A CULTURE BED HAVING A WATER-IMPREVIOUS BOTTOM, MEANS FOR INTRODUCING A FLOWING LAYER OF NUTRIENT SOLUTION DISCONTINUOUSLY AT ONE SIDE INTO SAID BED TO A DESIRED LEVEL, MEANS FOR REMOVING SAID FLOWING LAYER OF NUTRIENT SOLUTION AT THE OPPOSITE SIDE OF SAID BED, MEANS FOR MAINTAINING A SUBSTANTIALLY THINNER CONTINUOUSLY FLOWING LAYER OF NUTRIENT SOLUTION ON THE BOTTOM OF SAID BED, AND MEANS FOR MAINTAINING BOTH LAYERS OF NUTRIENT SOLUTION AT A DESIRED TEMPERATURE.
Claim 2
Dependent Claim
79 words
IN AN INSTALLATION FOR HYDROPONICS, A CULTURE BED HAVING A WATER-IMPREVIOUS BOTTOM, MEANS FOR INTRODUCING A FLOWING LAYER OF NUTRIENT SOLUTION DISCONTINUOUSLY AT ONE SIDE INTO SAID BED TO A DESIRED LEVEL, MEANS FOR REMOVING SAID FLOWING LAYER OF NUTRIENT SOLUTION AT THE OPPOSITE SIDE OF SAID BED, MEANS FOR MAINTAINING A SUBSTANTIALLY THINNER CONTINUOUSLY FLOWING LAYER OF NUTRIENT SOLUTION ON THE BOTTOM OF SAID BED, AND MEANS FOR MAINTAINING BOTH LAYERS OF NUTRIENT SOLUTION AT A DESIRED TEMPERATURE.
References Cited (Backward Citations)
US2051461A
Cited
US2060735A
Cited
US2121461A
Cited
US2592976A
Cited
DE805205C
Cited
US2639549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |