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US2856680A
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Diaphragm perforating and clamping means
Assignee: ACF Industries Inc
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Filing: 1955-12-19
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Granted: 1958-10-21
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Expires: 1975-12-19
Abstract
No abstract record available.
Inventors
- 👤 Eldon A Johnson
- 👤 Donald R Compton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:56
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/02; E21D20/025; F; F02; F02M; F02M59/00; F02M59/12; F02M59/14; F02M2700/00; F02M2700/13; F02M2700/1317; F02M2700/1323; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49238; Y10T29/49826; Y10T29/49833; Y10T29/49861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2104446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |