Patent US3129299A successfully refreshed from Google Patents.
US3129299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level control device with electrical switch means
Assignee: Individual
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Filing: 1960-08-31
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Granted: 1964-04-14
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Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Bondkirch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:36
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/18; G01F23/185; H; H01; H01H; H01H35/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
PRESSURE CONTROL MECHANISM COMPRISING A PRESSURERESPONSIVE MEMBER IN THE FORM OF A FLEXIBLE RESILIENT SHEET UNSUPPORTED EXCEPT AT TWO OPPOSITE EDGES, SUPPORTS FOR SUCH MEMBER ENGAGING THESE TWO RESPECTIVE EDGES, THE CENTRAL PORTION OF THE MEMBER BEING BOWED BETWEEN THESE EDGES AND DISPOSED TO BE MOVED BY THE PRESSURE IN A DIRECTION TO FLATTEN THE RESILIENT SHEET, ONE OF THE SUPPORTS BEING FIXED AND THE OTHER MOVABLE, A CONTROL DEVICE AND MEANS OPERATIVELY CONNECTED WITH THE MOVABLE SUPPORT FOR ACTUATING THE DEVICE, THE MECHANISM BEING CHARACTERIZED IN THAT THE FLEXIBLE RESILIENT SHEET IS PREFORMED TO A NATURAL BOWED SHAPE AND IN UNSTRESSED CONDITION SO THAT NO PRESSURE OF THE SUPPORTS AGAINST THE OPPOSITE EDGES OF THE MEMBER IS REQUIRED TO MAINTAIN THE MEMBER IN BOWED CONDITION.
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) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |