US3304670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalancing system
Assignee: Individual
•
Filing: 1964-02-24
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Granted: 1967-02-21
•
Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 James R Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:25
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
IN A CLOSURE HAVING TWO TELESCOPICALLY MOUNTED ELEMENTS IN RELATIVE UPPER AND LOWER POSITIONS, THE COMBINATION OF A COUNTERBALANCING SYSTEM ADAPTED TO EXERT A SUBSTANTIALLY CONSTANT FORCE TO MAINTAIN THE UPPER ELEMENT IN A SELECTED POSITION OF ADJUSTMENT AND COMPRISING A MOUNTIN FRAME; RESILIENT ENERGY STORAGE MEANS; MEANS ACHORING SAID STORAGE MEANS TO THE FRAME; A PRIMARY SHEAVE ROTATALY MOUNTED ON THE FRAME; MEANS CONNECTING SAID ENERGY STORAGE MEANS TO THE SHEAVE INCLUDING MEANS TO VARY THE EFFECTIVE LOWER ARM OF SAID SHEAVE; A PLURALITY OF CABLES ANCHORED TO THE SHEAVE TO PERMIT WINDING THEREABOUT AT A CONSTANT LEVER ARM, SAID CABLES PROVIDING INDIVIDUAL FREE ENDS; MEANS INDIVIDUALLY ANCHORING SAID FREE ENDS TO SAID LOWER ELEMENT; GUIDE SHEAVES AFFORDING PERIPHERAL SURFACES FOR GUIDING SAID CABLES BETWEEN THEIR RESPECTIVE ANCHORS AND SAID PRIMARY SHEAVE; AND MEANS ANCHORING SAID GUIDE SHEAVES TO SAID UPPER ELEMENT.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |