US3394499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring-operated door closing device
Assignee: Individual
•
Filing: 1966-05-03
•
Granted: 1968-07-30
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Expires: 1986-05-03
Abstract
No abstract record available.
Inventors
- 👤 Korthaus Helmut
- 👤 Wilke Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/1041; E05F1/12; E05F1/1207; E05F1/1223; E05F15/00; E05F15/40; E05F15/60; E05F15/603; E05F15/611; E05F15/616; E05F15/622; E05F1/02; E05F1/04; E05F1/06; E05F1/061; E05F1/066; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/218; E05Y2201/22; E05Y2201/23; E05Y2201/246; E05Y2201/252; E05Y2201/26; E05Y2201/262; E05Y2201/266; E05Y2201/40; E05Y2201/43; E05Y2201/434; E05Y2201/46; E05Y2201/462; E05Y2201/60; E05Y2201/622; E05Y2201/638; E05Y2201/696; E05Y2600/00; E05Y2600/40; E05Y2600/454; E05Y2800/00; E05Y2800/20; E05Y2800/23; E05Y2800/234; E05Y2800/25; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A SPRING-OPERATED DOOR CLOSING DEVICE, COMPRISING A HOUSING ADAPTED TO BE SECURED BETWEEN A DOOR AND A DOOR FRAME, A BALL-SPINDLE DRIVE OPERATIVELY CONNECTED WITH A DOOR AND WITH SAID HOUSING, RESPECTIVELY, SAID HOUSING COMPRISING A HOLLOW BODY OF ROTATIONAL SYMMETRY, SAID BALL-SPINDLE DRIVE COMPRISING DRIVING MEANS DISPOSED IN THE LONGITUDINAL CENTRAL AXIS OF SAID HOUSING AND INCLUDING A SPINDLE ROTATABLY AND AXIALLY IMMOVABLY MOUNTED FOR PERFORMING ONE OF THE OPERATIONAL MOVEMENTS, AND A DOOR-OPERATING MEMBER NONROTATABLY AND AXIALLY MOVABLY DISPOSED, AND A PLURALITY OF CLOSING SPRINGS DISPOSED EQUALLY DIVIDED CONCENTRICALLY IN SAID HOUSING AND SECURED AT ONE END TO SAID DOOR-OPERATING MEMBER FOR PERFORMING DIRECTLY THE OTHER OF THE OPERATIONAL MOVEMENTS.
Claim 2
Dependent Claim
112 words
A SPRING-OPERATED DOOR CLOSING DEVICE, COMPRISING A HOUSING ADAPTED TO BE SECURED BETWEEN A DOOR AND A DOOR FRAME, A BALL-SPINDLE DRIVE OPERATIVELY CONNECTED WITH A DOOR AND WITH SAID HOUSING, RESPECTIVELY, SAID HOUSING COMPRISING A HOLLOW BODY OF ROTATIONAL SYMMETRY, SAID BALL-SPINDLE DRIVE COMPRISING DRIVING MEANS DISPOSED IN THE LONGITUDINAL CENTRAL AXIS OF SAID HOUSING AND INCLUDING A SPINDLE ROTATABLY AND AXIALLY IMMOVABLY MOUNTED FOR PERFORMING ONE OF THE OPERATIONAL MOVEMENTS, AND A DOOR-OPERATING MEMBER NONROTATABLY AND AXIALLY MOVABLY DISPOSED, AND A PLURALITY OF CLOSING SPRINGS DISPOSED EQUALLY DIVIDED CONCENTRICALLY IN SAID HOUSING AND SECURED AT ONE END TO SAID DOOR-OPERATING MEMBER FOR PERFORMING DIRECTLY THE OTHER OF THE OPERATIONAL MOVEMENTS.
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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |