US4599739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental radiographic apparatus for photographing entire jaws
Assignee: J Morita Manufaturing Corp
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Filing: 1985-01-18
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Granted: 1986-07-08
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Expires: 2005-01-18
Abstract
Abstract A radiographic apparatus for photographing the entire jaws designed to make a tomogram of a curved plane approximate to a dental arch by the locus of center of rotation of the X-ray beam projected from an X-ray source onto an X-ray film holder describing an approximately V-shaped envelope which forms an apex on an approximate medial line and recedes from the apex toward the left and right of the approximate medial line by moving a rotary arm around a patient, the arm having the X-ray source at one end and the X-ray film holder at the other end thereof, wherein the apparatus comprises a means for changing straight-line distance on the approximate medial line between the apex and receding point of limit of the envelope and a means for indicating the distance of shift thus changed or a means for automatically moving the indication means a distance equal to the distance of shift.
Inventors
- 👤 Kazuo Nishikawa
- 👤 Keisuke Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:28
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A radiographic apparatus for photographing the entire jaws designed to make a tomogram of a curved plane approximate to a dental arch by the locus of center of rotation of the X-ray beam projected from an X-ray source onto an X-ray film holder describing an approximately V-shaped envelope which forms an apex on an approximate medial line and recedes from the apex toward the left and right of the approximate medial line by moving a rotary arm around a patient without interference with the patient, the arm having the X-ray source at one end and the X-ray film holder at the other end thereof, said apparatus being characterized in that it comprises a means for changing straight-line distance on the approximate medial line between the apex and receding point of limit of the envelope and a means for indicating the distance of shift thus changed or a means for automatically moving the indication means a distance equal to the distance of shift.
Claim 2
Dependent Claim
162 words
A radiographic apparatus for photographing the entire jaws designed to make a tomogram of a curved plane approximate to a dental arch by the locus of center of rotation of the X-ray beam projected from an X-ray source onto an X-ray film holder describing an approximately V-shaped envelope which forms an apex on an approximate medial line and recedes from the apex toward the left and right of the approximate medial line by moving a rotary arm around a patient without interference with the patient, the arm having the X-ray source at one end and the X-ray film holder at the other end thereof, said apparatus being characterized in that it comprises a means for changing straight-line distance on the approximate medial line between the apex and receding point of limit of the envelope and a means for indicating the distance of shift thus changed or a means for automatically moving the indication means a distance equal to the distance of shift.
Claim 3
Dependent Claim
79 words
An apparatus according to claim 1, wherein said straight-line distance changing means includes rails fixed to a fixed frame in parallel relation with the approximate medial line and a horizontal rotary arm movable in its center of rotation along the rails and wherein said indication means includes an indication frame attached to the front end of a bracket so as to be movable back and forth, the bracket projecting from the fixed frame parallelly to the approximate medial line.
Claim 4
Dependent Claim
30 words
An apparatus according to claim 2, further including a means for manually moving the indication frame a distance to the distance of shift of the horizontal arm along the rails.
Claim 5
Dependent Claim
114 words
An apparatus according to claim 1, wherein said means for automatically moving the indication means in parallel relation to the approximate medial line comprises a relative decision circuit, the circuit relatively deciding the respective pieces of electric position information from a means for detecting the amount of shift of the envelope and from a means for detecting the position of the indication means to thereby output the direction of shift and amount of shift due to the indication means in terms of a position signal, and a motor drive circuit which drives an indication means driving motor in the direction of shift and in the amount of shift in accordance with the position signal.
Claim 6
Dependent Claim
157 words
An apparatus according to claim 1, wherein the direction of shift and the amount of shift of the indication means are indicated by a light display means and the indication means is manually shifted in accordance with the light display means and wherein the light display means comprises a relative decision circuit, the circuit relatively deciding the respective pieces of electric position information from a potentiometer for detecting the amount of shift of the envelope and from a potentiometer for detecting the position of the indication means to thereby output the direction of shift and amount of shift due to the indication means in terms of a position signal, a display circuit which outputs to display the direction of shift and amount of shift in accordance with the output of the relative decision circuit, and a display unit which displays the direction of shift and amount of shift in accordance with the output of the display circuit.
Claim 7
Dependent Claim
58 words
An apparatus according to claim 5, wherein the direction of shift is displayed by a lit-up arrow and the amount of shift is displayed in the form of a lit-up dot while the amount is not in agreement with the proper amount of shift and when the amount is brought into agreement, the lit-up dot is put out.
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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |