US2940218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nutrient fluid control in hydroponic systems
Assignee: Hydroponics Inc
•
Filing: 1957-02-11
•
Granted: 1960-06-14
•
Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Richard S Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:01
CPC Classifications
A; A01; A01G; A01G31/00; A01G31/02; A01G31/06; Y; Y02; Y02P; Y02P60/00; Y02P60/20; Y02P60/21; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/272; Y10T137/2774
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE206810C
Cited
NL41867C
Cited
GB212909A
Cited
CH110105A
Cited
FR639901A
Cited
FR857501A
Cited
US2716422A
Cited
FR1070140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |