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US2184773A
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Assignee: CLAUDE V BIRKHEAD
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Filing: 1938-04-12
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Granted: 1939-12-26
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Expires: 1958-04-12
Abstract
No abstract record available.
Inventors
- 👤 James E Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:17
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/30; F16K1/304; F16K1/306; F16K1/307; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2511; Y10T137/7722; Y10T137/7771; Y10T137/7779; Y10T137/7781; Y10T137/7793
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) | 1942-12-25 | 1943-06-26 | 1943-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-25 | 1947-06-26 | 1947-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-25 | 1951-06-26 | 1951-12-26 | $7700.00 | Window Closed / Lapsed |