Patent US3147946A successfully refreshed from Google Patents.
US3147946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utility stool
Assignee: Vacudent Manufacturing Co
•
Filing: 1961-10-13
•
Granted: 1964-09-08
•
Expires: 1981-10-13
Abstract
No abstract record available.
Inventors
- 👤 Dean H Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:15
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/14; A47C3/20; A47C3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
PNEUMATICALLY POWERED SEATING STRUCTURE, COMPRISING A SEAT; MEANS FOR SUPPORTING THE SEAT, INCLUDING A SUPPORT AND A HYDRAULIC PISTON AND CYLINDER INTERPOSED BETWEEN SEAT AND SUPPORT, WITH ONE SECURED TO THE SEAT AND ONE SECURED TO THE SUPPORT; SAID PISTON BEING SEPARATED TRANSVERSELY INTO TWO INDEPENDENT PARTS, ONE OF SAID PARTS BEING FREE OF OTHER STRUCTURE AND CARRYING A SEAL WIPING THE CYLINDER WALLS, THE OTHER OF SAID PARTS BEING FREELY ROTATABLE WITHIN THE CYLINDER; A FLUID-TIGHT RESERVOIR IN FLUID-FLOW COMMUNICATION WITH THE CYLINDER, FOR EXTENDING PISTON AND CYLINDER RELATIVE TO EACH OTHER; A HYDRAULIC FLUID PARTIALLY FILLING THE RESERVOIR; A COMPRESSED FLUID TRAPPED WITHIN THE RESERVOIR AND EXERTING SEAT-RAISING PRESSURE ON SAID HYDRAULIC FLUID; A CONTROL VALVE NORMALLY CLOSING SAID COMMUNICATION BETWEEN RESERVOIR AND CYLINDER; AND MEANS FOR OPENING SAID VALVE AS AND WHEN DESIRED, FOR RAISING THE SEAT.
Claim 2
Dependent Claim
140 words
PNEUMATICALLY POWERED SEATING STRUCTURE, COMPRISING A SEAT; MEANS FOR SUPPORTING THE SEAT, INCLUDING A SUPPORT AND A HYDRAULIC PISTON AND CYLINDER INTERPOSED BETWEEN SEAT AND SUPPORT, WITH ONE SECURED TO THE SEAT AND ONE SECURED TO THE SUPPORT; SAID PISTON BEING SEPARATED TRANSVERSELY INTO TWO INDEPENDENT PARTS, ONE OF SAID PARTS BEING FREE OF OTHER STRUCTURE AND CARRYING A SEAL WIPING THE CYLINDER WALLS, THE OTHER OF SAID PARTS BEING FREELY ROTATABLE WITHIN THE CYLINDER; A FLUID-TIGHT RESERVOIR IN FLUID-FLOW COMMUNICATION WITH THE CYLINDER, FOR EXTENDING PISTON AND CYLINDER RELATIVE TO EACH OTHER; A HYDRAULIC FLUID PARTIALLY FILLING THE RESERVOIR; A COMPRESSED FLUID TRAPPED WITHIN THE RESERVOIR AND EXERTING SEAT-RAISING PRESSURE ON SAID HYDRAULIC FLUID; A CONTROL VALVE NORMALLY CLOSING SAID COMMUNICATION BETWEEN RESERVOIR AND CYLINDER; AND MEANS FOR OPENING SAID VALVE AS AND WHEN DESIRED, FOR RAISING THE SEAT.
References Cited (Backward Citations)
US394224A
Cited
US413156A
Cited
US530880A
Cited
US562390A
Cited
US1488206A
Cited
US2231631A
Cited
US2590718A
Cited
US2542480A
Cited
US2446127A
Cited
US2692012A
Cited
US2597332A
Cited
US2587121A
Cited
FR1072606A
Cited
US2778627A
Cited
US2698047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |