Patent US3548867A successfully refreshed from Google Patents.
US3548867A
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Pressure relief devices
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1969-05-13
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Granted: 1970-12-22
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Expires: 1989-05-13
Abstract
No abstract record available.
Inventors
- 👤 Hans Theodor Grisebach
- 👤 Walter Weirich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/0446; F16K17/046; E; E21; E21D; E21D15/00; E21D15/14; E21D15/46; E21D15/465; F16K2200/00; F16K2200/30; F16K2200/301; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7837; Y10T137/7838; Y10T137/7841; Y10T137/7845; Y10T137/7904; Y10T137/7922; Y10T137/7925
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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |