Patent US2831503A successfully refreshed from Google Patents.
US2831503A
Expired / Lapsed
US
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Dual conduit valve and fitting
Assignee: Individual
•
Filing: 1956-04-20
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Granted: 1958-04-22
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Expires: 1976-04-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Malcolm M Argo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:30
CPC Classifications
F; F16; F16K; F16K5/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86558; Y10T137/86566; Y10T137/87153; Y10T137/87161
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US139352A
Cited
US142120A
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US152397A
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US173695A
Cited
US2599063A
Cited
US681690A
Cited
US1241159A
Cited
US2301428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |