US3744236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-piece of improved readability in darkness
Assignee: Suwa Seikosha KK
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Filing: 1971-12-22
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Granted: 1973-07-10
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Expires: 1991-12-22
Abstract
Abstract In a time-piece dial wherein the hands as well as one or more of the indicia are marked with luminous paint, readability in darkness is improved by using paints luminescing in different colors for each of the two hands and by distinguishing at least one of the markers from the remainder of the markers through the use of suitable luminescent paints.
Inventors
- 👤 M Kishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/30; G04B19/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A watch-face of improved readability in darkness comprising markers formed by a plurality of luminescent paints, each paint producing a different color, and time-indicating hands comprising an hour hand and a minute hand cooperating with said markers to indicate the hour and the minute each of said hands having thereon a paint luminescing in a color different from the other.
Claim 2
Dependent Claim
60 words
A watch-face of improved readability in darkness comprising markers formed by a plurality of luminescent paints, each paint producing a different color, and time-indicating hands comprising an hour hand and a minute hand cooperating with said markers to indicate the hour and the minute each of said hands having thereon a paint luminescing in a color different from the other.
Claim 3
Dependent Claim
65 words
A watch-face as defined in claim 1, wherein the marker at the 12 position is painted to luminesce in a first color, the remaining markers are painted to luminesce in a second color, the hour hand is painted to luminesce in one of said first and second colors, and the minute hand is painted to luminesce in the other of said first and second colors.
Claim 4
Dependent Claim
63 words
A watch-face as defined in claim 1, wherein said marker at said 12 position is painted to luminesce in a first color, the markers at the remaining positions from one to 11 are painted to luminesce in a second color, said hour hand is painted to luminesce in a third color and said minute hand is painted to luminesce in a fourth color.
Claim 5
Dependent Claim
19 words
A watch-face as defined in claim 3, wherein a second hand is painted to luminesce in a fifth color.
Claim 6
Dependent Claim
39 words
A watch-face as defined in claim 1, wherein markers at the three, six, nine and 12 positions are painted to luminesce in a first color, and markers at the remaining positions are painted to luminesce in a second color.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |