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Patent US2438642A successfully refreshed from Google Patents.
US2438642A
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Apparatus for inserting valve elements
Assignee: Individual
•
Filing: 1944-11-20
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Granted: 1948-03-30
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Expires: 1964-11-20
Abstract
No abstract record available.
Inventors
- 👤 Earnest E Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:42
CPC Classifications
B; B23; B23P; B23P19/00; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53657; Y10T29/53796; Y10T29/5383; Y10T29/53909; Y10T29/53913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US864226A
Cited
US1474227A
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US1733610A
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US1739270A
Cited
US1913933A
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US2031797A
Cited
FR809915A
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 |