US2909191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anhydrous ammonia metering device
Assignee: John Blue Co Inc
•
Filing: 1955-12-27
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Granted: 1959-10-20
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Expires: 1975-12-27
Abstract
No abstract record available.
Inventors
- 👤 Donelson B Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; A; A01; A01C; A01C23/00; A01C23/02; A01C23/023; A01C23/024; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/7793; Y10T137/7801; Y10T137/8158; Y10T137/8175
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2117182A
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US2301041A
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US2342653A
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US2307949A
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US2628638A
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US2608209A
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US2637979A
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US2720891A
Cited
US2807144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |