Patent US3176712A successfully refreshed from Google Patents.
US3176712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-return valve
Assignee: Individual
•
Filing: 1962-09-24
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Granted: 1965-04-06
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Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Ramsden Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K2200/00; F16K2200/30; F16K2200/305; F16K2200/3052; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/7859; Y10T137/7861
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A CHECK VALVE INCLUDING A PAIR OF PIPES HAVING ALIGNED PASSAGES AND A PAIR OF SPACED ADJACENT ENDS, MEANS SECURING THE ENDS OF THE PIPES TOGETHER, A RIGID DISC AND AN ELASTIC DISC OF RUBBER LIEK MATERIAL, SAID DISCS BEING IN SIDE BY SIDE RELATION AND EXTENDING ACROSS SAID PASSAGES WITH SAID RIGID DISC SUPPORTING SAID ELASTIC DISC, SAID DISCS HAVING PERIPHERAL EDGE PORTIONS SNUGLY FITTING BETWEEN SAID PIPE ENDS, SAID RIGID DISC HAVING PORTS THERETHROUGH WHICH ARE RADIALLY SPACED BETWEEN THE CENTER OF SAID RIGID DISC AND ITS PERIPHERAL EDGE PORTIONS, SAID ELASTIC DISC HAVING A HOLE THROUGH THE CENTER THEREOF, A SEMI-SPHERICAL KNOB LARGER IN DIAMETER THAN THE HOLE IN SAID ELASTIC DISC SECURED TO THE CENTER OF SAID RIGID DISC AND EXTENDING INTO SAID HOLE SO AS TO SEAL SAME.
Claim 2
Dependent Claim
133 words
A CHECK VALVE INCLUDING A PAIR OF PIPES HAVING ALIGNED PASSAGES AND A PAIR OF SPACED ADJACENT ENDS, MEANS SECURING THE ENDS OF THE PIPES TOGETHER, A RIGID DISC AND AN ELASTIC DISC OF RUBBER LIEK MATERIAL, SAID DISCS BEING IN SIDE BY SIDE RELATION AND EXTENDING ACROSS SAID PASSAGES WITH SAID RIGID DISC SUPPORTING SAID ELASTIC DISC, SAID DISCS HAVING PERIPHERAL EDGE PORTIONS SNUGLY FITTING BETWEEN SAID PIPE ENDS, SAID RIGID DISC HAVING PORTS THERETHROUGH WHICH ARE RADIALLY SPACED BETWEEN THE CENTER OF SAID RIGID DISC AND ITS PERIPHERAL EDGE PORTIONS, SAID ELASTIC DISC HAVING A HOLE THROUGH THE CENTER THEREOF, A SEMI-SPHERICAL KNOB LARGER IN DIAMETER THAN THE HOLE IN SAID ELASTIC DISC SECURED TO THE CENTER OF SAID RIGID DISC AND EXTENDING INTO SAID HOLE SO AS TO SEAL SAME.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |