Patent US3605339A successfully refreshed from Google Patents.
US3605339A
Expired / Lapsed
US
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Manual balanced door
Assignee: LANSON INDUSTRIES Inc
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Filing: 1969-05-06
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Granted: 1971-09-20
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Expires: 1989-05-06
Abstract
Abstract A MANUALLY BALANCED DOOR COMPRISING A DOOR HAVING A BALANCED HINGE ARRANGEMENT WHEREIN EACH HINGE POINT IS PROVIDED WITH A UNIQUE BEARING ASSEMBLY COMPRISING, IN COMBINATION, THRUST BEARINGS, NEEDLE BEARINGS AND SELF-ALIGNING BEARINGS, THERE BEING A DOOR OPERATOR ADAPTED FOR ACTUATION PURSUANT TO MANUALLY INITIATED SWINGING OF THE DOOR WHICH OPERATOR INCORPORATES MEANS FOR CONTROLLING THE SPEED OF SWING THROUGH THE OPENING AND CLOSING ARCS OF MOVEMENT AND FURTHER EMBODIES A RESILIENT MEMBER FOR STORING OF ENERGY DURING OPENING MOVEMENT TO EFFECTUATE CLOSING UPON RELEASE THEREOF.
Inventors
- 👤 John C Catlett
- 👤 James R Gilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:35
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/102; E05D; E05D15/00; E05D15/28; E05D15/30; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |