US3270771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient disc check valve
Assignee: Robertshaw Controls Co
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Filing: 1963-06-11
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Granted: 1966-09-06
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Morgan David Luke
- 👤 Harold F Snider
- 👤 Mingrone Frank Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/1402; F16K15/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A RESILIENT VALVE ELEMENT COMPRISING A DISC-SHAPED PORTION HAVING A CENTRAL OPENING, THE THICKNESS OF SAID PORTION VARYING INVERSELY WITH THE RADIAL DISTANCE FROM SAID OPENING, ONE SIDE OF SAID PORTION PRESENTING A FLAT SURFACE; AN INTEGRAL FLEXIBLE ANNULAR LIP EXTENDING RADIALLY INWARD FROM SAID PORTION AT SAID OPENING, ONE SIDE OF SAID LIP BEING AN EXTENSION OF SAID FLAT SURFACE AND EXTENDING OUTWARDLY FROM SAID SURFACE AND AN INTEGRAL BEAD AT THE PERIPHERY OF SAID DISC-SHAPED PORTION.
Claim 2
Dependent Claim
78 words
A RESILIENT VALVE ELEMENT COMPRISING A DISC-SHAPED PORTION HAVING A CENTRAL OPENING, THE THICKNESS OF SAID PORTION VARYING INVERSELY WITH THE RADIAL DISTANCE FROM SAID OPENING, ONE SIDE OF SAID PORTION PRESENTING A FLAT SURFACE; AN INTEGRAL FLEXIBLE ANNULAR LIP EXTENDING RADIALLY INWARD FROM SAID PORTION AT SAID OPENING, ONE SIDE OF SAID LIP BEING AN EXTENSION OF SAID FLAT SURFACE AND EXTENDING OUTWARDLY FROM SAID SURFACE AND AN INTEGRAL BEAD AT THE PERIPHERY OF SAID DISC-SHAPED PORTION.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |