Patent US3889998A successfully refreshed from Google Patents.
US3889998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable dental chair
Assignee: Siemens AG
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Filing: 1973-10-17
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Granted: 1975-06-17
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Expires: 1993-10-17
Abstract
Abstract An adjustable dental chair having a back with manually operated switches located upon the upper part of the back for releasing an operating procedure to adjust the chair. The switches are so arranged that actuating members operatively connected with the switches are located in a space defined substantially by the upper edge of the back and a limiting line located substantially by the length of a hand width below the upper edge.
Inventors
- 👤 Rolf-Jurgen Weiland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:44
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
An adjustable dental patient''s chair, comprising a seat and a back, means for adjusting said seat and said back, manually operated switching means operatively connected with said adjusting means for actuating them, said switching means comprising switch elements and actuating members connected with said switch elements for actuating them, said actuating members having substantially flat key surfaces on their actuating sides and being located in the middle part of the rear side of the upper portion of said back, which part is limited by the upper edge of said back and a limiting line located substantially by the length of 10 to 15 cm width below said upper edge.
Claim 2
Dependent Claim
109 words
An adjustable dental patient''s chair, comprising a seat and a back, means for adjusting said seat and said back, manually operated switching means operatively connected with said adjusting means for actuating them, said switching means comprising switch elements and actuating members connected with said switch elements for actuating them, said actuating members having substantially flat key surfaces on their actuating sides and being located in the middle part of the rear side of the upper portion of said back, which part is limited by the upper edge of said back and a limiting line located substantially by the length of 10 to 15 cm width below said upper edge.
Claim 3
Dependent Claim
150 words
An adjustable dental patient''s chair, comprising a seat and a back, means for adjusting said seat and said back, manually operated switching means operatively connected with said adjusting means for actuating them, said switching means comprising switch elements and actuating members connected with said switch elements for actuating them, said actuating members being narrow and elongatedly shaped, having longitudinal axes extending parallel to the longitudinal symmetry axis of said back and having substantially flat key surfaces on their actuating sides, said actuating members being located in the middle part of the rear side of the upper portion of said back, which part is limited by the upper edge of said back and a limiting line located substantially by the length of 10 to 15 cm width below said upper edge, and wherein one of the narrow sides of the actuating members is adjacent to the upper edge of said back.
Claim 4
Dependent Claim
150 words
An adjustable dental patient''s chair, comprising a seat and a back, means for adjusting said seat and said back, manually operated switching means operatively connected with said adjusting means for actuating them, said switching means comprising switch elements and actuating members connected with said switch elements for actuating them, said actuating members being narrow and elongatedly shaped, having longitudinal axes extending parallel to the longitudinal symmetry axis of said back and having substantially flat key surfaces on their actuating sides, said actuating members being located in the middle part of the rear side of the upper portion of said back, which part is limited by the upper edge of said back and a limiting line located substantially by the length of 10 to 15 cm width below said upper edge, and wherein one of the narrow sides of the actuating members is adjacent to the upper edge of said back.
Claim 5
Dependent Claim
37 words
A dental patient''s chair according to claim 2, wherein said actuating members comprise arc shaped end portions extending around the upper edge of said back, the arch of said end portions are directed toward the chair. Pg,13
Claim 6
Dependent Claim
30 words
A dental patients'' chair according to claim 3, wherein said actuating members are flat form pieces, the chair having means supporting said form pieces for movement in their longitudinal extension.
Claim 7
Dependent Claim
19 words
A dental patients'' chair according to claim 4, wherein said form pieces have gripping recesses upon their outer surfaces.
Claim 8
Dependent Claim
42 words
A dental patient''s chair according to claim 4, wherein said switches are combined in a switch set, wherein said actuating members of said switches have key surfaces extending at least partly parallel to the plane of the rear side of said back.
References Cited (Backward Citations)
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |