Patent US2686532A successfully refreshed from Google Patents.
US2686532A
Expired / Lapsed
US
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Balanced pressure and vacuum regulator
Assignee: Individual
•
Filing: 1949-01-25
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Granted: 1954-08-17
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Expires: 1969-01-25
Abstract
No abstract record available.
Inventors
- 👤 Segerstad Carl Gustaf Hard Af
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/0616; G05D16/0619; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US120958A
Cited
US1690097A
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US2043453A
Cited
US1916635A
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US2047101A
Cited
US2117800A
Cited
US2351871A
Cited
US2521264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |