US2438672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve indexing means
Assignee: Parker Appliance Co
•
Filing: 1944-09-05
•
Granted: 1948-03-30
•
Expires: 1964-09-05
Abstract
No abstract record available.
Inventors
- 👤 Margrave Wilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:48
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0008; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1498171A
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US1670691A
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GB329240A
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US2109451A
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US2060256A
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US2108299A
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US2161070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |