Patent US2740423A successfully refreshed from Google Patents.
US2740423A
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Assignee: Individual
•
Filing: 1952-03-15
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Granted: 1956-04-03
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Expires: 1972-03-15
Abstract
No abstract record available.
Inventors
- 👤 Crawford K Stillwagon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:30
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/006; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263; F16K1/2265; Y; Y10; Y10T; Y10T137/00; Y10T137/7504
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1164033A
Cited
US1113570A
Cited
US1977351A
Cited
DE670327C
Cited
US2385510A
Cited
US2600497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |