Patent US2536663A successfully refreshed from Google Patents.
US2536663A
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Pressure regulating system for filters
Assignee: Sulzer AG
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Filing: 1944-10-17
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Granted: 1951-01-02
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Expires: 1964-10-17
Abstract
No abstract record available.
Inventors
- 👤 Schaer Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:08
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/16; B; B01; B01D; B01D35/00; B01D35/14; B01D35/147; B01D35/157; F01M1/10; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191303647A
Cited
US2072180A
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US2103299A
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US2138969A
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US2423329A
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US2460048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |