US2611218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot-operated valve
Assignee: Spence Engineering Co Inc
•
Filing: 1946-10-11
•
Granted: 1952-09-23
•
Expires: 1966-10-11
Abstract
No abstract record available.
Inventors
- 👤 Spence Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:43
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/16; G05D16/163; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/776; Y10T137/7762; Y10T137/7769; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7796
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1231257A
Cited
US1549745A
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US1725783A
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US2185713A
Cited
US1961813A
Cited
US2257171A
Cited
US2304323A
Cited
US2431283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |