US3828720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual purpose dial mechanism
Assignee: CAR TAPES Inc
•
Filing: 1973-04-09
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Granted: 1974-08-13
•
Expires: 1993-04-09
Abstract
Abstract A dial and mask combination enables alternate selection of AM or FM broadcast frequencies. The movement of the mask is directly controlled by an FM-AM selector switch. Selecting the FM portion moves the mask to a first position, displaying a portion of the dial representing FM frequencies. Selecting the AM portion moves the mask to a second position, displaying a portion of the dial representing AM frequencies.
Inventors
- 👤 R Herst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:34
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A combined FM and AM dial member comprising: a given display area having a plurality of transparent indicia substantially filling said display area; and a movable mask adjacent said display area and having discrete opaque portions for obscuring selected portions of said transparent indicia, said mask being movable in a first selected position for displaying a first portion of said indicia representing an AM dial and movable in a second selected position for displaying a second portion of said indicia representing an FM dial.
Claim 2
Dependent Claim
84 words
A combined FM and AM dial member comprising: a given display area having a plurality of transparent indicia substantially filling said display area; and a movable mask adjacent said display area and having discrete opaque portions for obscuring selected portions of said transparent indicia, said mask being movable in a first selected position for displaying a first portion of said indicia representing an AM dial and movable in a second selected position for displaying a second portion of said indicia representing an FM dial.
Claim 3
Dependent Claim
20 words
A combination according to claim 1 in which said display area is substantially opaque and only said indicia are transparent.
Claim 4
Dependent Claim
21 words
A combination according to claim 1 in which said movable mask is substantially transparent and only said discrete portions are opaque.
Claim 5
Dependent Claim
32 words
A combination according to claim 1 in which said mask is mOvable only in a horizontal direction and in which the amount of movement relative to said fixed display area is controllable.
Claim 6
Dependent Claim
18 words
A combination according to claim 1 which includes a movable pointer adapted to traverse said fixed display area.
Claim 7
Dependent Claim
13 words
A combination according to claim 5 in which said movable pointer is transparent.
Claim 8
Dependent Claim
41 words
A combination according to claim 1 in which said indicia for representing the AM dial include the numbers 55, 69, 100, 135 and 155, and said indicia for representing the FM dial include the numbers 88, 92, 100, 106 and 188.
References Cited (Backward Citations)
US1594703A
Cited
GB291912A
Cited
US2426079A
Cited
US3125985A
Cited
US3605681A
Cited
US3502049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |