US3008481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure selector
Assignee: George W Dahl Co Inc
•
Filing: 1959-05-22
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Granted: 1961-11-14
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Expires: 1979-05-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Matheson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:19
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F15; F15B; F15B20/00; F16K31/365; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/5109; Y10T137/5196
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |