US3286985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lifting device
Assignee: Individual
•
Filing: 1965-07-12
•
Granted: 1966-11-22
•
Expires: 1985-07-12
Abstract
No abstract record available.
Inventors
- 👤 Edera Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:44
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A HYDRAULIC LIFTING DEVICE COMPRISING: A CENTRAL VERTICAL SHAFT HAVING A LIFTING CYLINDER; LOAD SUPPORTING MEANS CONNECTED TO SAID CYLINDER FOR RAISING AND LOWERING A LOAD; A HYDRAULIC FLUID RESERVOIR AROUND SAID CYLINDER; MEANS SEALING IN SAID FLUID FROM THE ATMOSPHERE; A CASTING SECURED TO SAID SHAFT, SAID CASTING INCLUDING THREE VERTICAL PARALLEL BORES, A FIRST BORE HAVING MEANS FOR PUMPING SAID FLUID, A SECOND BORE HAVING MEANS FOR DIRECTING THE FLOW OF SAID FLUID AND PROVIDING RELIEF FOR OVERLOADS, A THIRD BORE HAVING MEANS REGULATING THE FLOW OF SAID FLUID; MEANS COMMUNICATING BETWEEN SAID BORES, LIFTING CYLINDER AND RESERVOIR TO PERMIT FLOW AND SAID FLUID THEREBETWEEN AND INCLUDING A PASSAGE BELOW SAID CYLINDER; MEANS FOR RECIPROCATING
Claim 2
Dependent Claim
117 words
A HYDRAULIC LIFTING DEVICE COMPRISING: A CENTRAL VERTICAL SHAFT HAVING A LIFTING CYLINDER; LOAD SUPPORTING MEANS CONNECTED TO SAID CYLINDER FOR RAISING AND LOWERING A LOAD; A HYDRAULIC FLUID RESERVOIR AROUND SAID CYLINDER; MEANS SEALING IN SAID FLUID FROM THE ATMOSPHERE; A CASTING SECURED TO SAID SHAFT, SAID CASTING INCLUDING THREE VERTICAL PARALLEL BORES, A FIRST BORE HAVING MEANS FOR PUMPING SAID FLUID, A SECOND BORE HAVING MEANS FOR DIRECTING THE FLOW OF SAID FLUID AND PROVIDING RELIEF FOR OVERLOADS, A THIRD BORE HAVING MEANS REGULATING THE FLOW OF SAID FLUID; MEANS COMMUNICATING BETWEEN SAID BORES, LIFTING CYLINDER AND RESERVOIR TO PERMIT FLOW AND SAID FLUID THEREBETWEEN AND INCLUDING A PASSAGE BELOW SAID CYLINDER; MEANS FOR RECIPROCATING
References Cited (Backward Citations)
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Cited
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Cited
US2165095A
Cited
US2414484A
Cited
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Cited
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Cited
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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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |