US2421713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic orifice control
Assignee: Briggs Filtration Co
•
Filing: 1942-09-30
•
Granted: 1947-06-03
•
Expires: 1962-09-30
Abstract
No abstract record available.
Inventors
- 👤 Roscoe C Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; G05D23/1854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US857452A
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US1206625A
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US1768558A
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US1888225A
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US1968553A
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US1964638A
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US1972907A
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US2008835A
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US2184607A
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US2257972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |