Patent US3019809A successfully refreshed from Google Patents.
US3019809A
Expired / Lapsed
US
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Combined vacuum valve and cold trap
Assignee: Ipsen Industries Inc
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Filing: 1960-09-13
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Granted: 1962-02-06
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Expires: 1980-09-13
Abstract
No abstract record available.
Inventors
- 👤 Harold N Ipsen
- 👤 Karl H Seelandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:22
CPC Classifications
F; F16; F16K; F16K51/00; F16K51/02; F04; F04F; F04F9/00; F27; F27B; F27B5/00; F27B5/04; Y; Y10; Y10S; Y10S55/00; Y10S55/15; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |