US3359386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge exclusion diaphragm switch
Assignee: Howard Electric Co
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Filing: 1965-10-11
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Granted: 1967-12-19
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Expires: 1985-10-11
Abstract
No abstract record available.
Inventors
- 👤 William F Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:17
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/22; H01H3/24; H01H35/00; H01H35/24; H01H35/34; H01H35/346
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A FLUID PRESSURE OPERATED UNIT, COMPRISING A HOUSING STRUCTURE HAVING A FLEXIBLE, FLUID PRESSURE RESPONSIVE DIAPHRAGM SECURED THERETO AND INTERNALLY SEALING A HOUSING SPACE ON ONE SIDE OF SAID DIAPHRAGM, A PROTECTIVE DIAPHRAGM HAVING A LIQUID TIGHT CONNECTION ACROSS SAID STRUCTURE ON A SIDE OF SAID HOUSING SPACE REMOTE FROM SAID FIRST NAMED DIAPHRAGM, AND A VOLUME OF AIR OR OTHER COMPRESSIBLE GAS FILLING THE SPACE BETWEEN SAID DIAPHRAGMS, SAID PROTECTIVE DIAPHRAGM BEING FLEXIBLE UNDER
Claim 2
Dependent Claim
75 words
A FLUID PRESSURE OPERATED UNIT, COMPRISING A HOUSING STRUCTURE HAVING A FLEXIBLE, FLUID PRESSURE RESPONSIVE DIAPHRAGM SECURED THERETO AND INTERNALLY SEALING A HOUSING SPACE ON ONE SIDE OF SAID DIAPHRAGM, A PROTECTIVE DIAPHRAGM HAVING A LIQUID TIGHT CONNECTION ACROSS SAID STRUCTURE ON A SIDE OF SAID HOUSING SPACE REMOTE FROM SAID FIRST NAMED DIAPHRAGM, AND A VOLUME OF AIR OR OTHER COMPRESSIBLE GAS FILLING THE SPACE BETWEEN SAID DIAPHRAGMS, SAID PROTECTIVE DIAPHRAGM BEING FLEXIBLE UNDER
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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |