US2253304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeability tuner and operating mechanism therefor
Assignee: Johnson Laboratories Inc
•
Filing: 1937-12-24
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Granted: 1941-08-19
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Expires: 1957-12-24
Abstract
No abstract record available.
Inventors
- 👤 Philip K Mcgall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:53
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/02; H01F21/06; H01F21/065; H05; H05K; H05K9/00; H05K9/0007; H05K9/0018; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/188; Y10T74/18808; Y10T74/18832; Y10T74/18848; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/2042; Y10T74/20426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-08-18 | 1945-02-17 | 1945-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-18 | 1949-02-17 | 1949-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-18 | 1953-02-17 | 1953-08-19 | $7700.00 | Window Closed / Lapsed |