US3866409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crown assembly
Assignee: Seiko Instruments Inc
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Filing: 1973-12-27
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Granted: 1975-02-18
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Expires: 1993-12-27
Abstract
Abstract A crown assembly for use on wrist watches having a crown provided with an axial blind bore. A stem has an end portion received in the blind bore and is fixedly coupled thereto by coupling means having an interference fit with the blind bore. The arrangement permits the crown assembly to be manufactured with the crown and stem made independently and of different materials.
Inventors
- 👤 Kumiko Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
G; G04; G04B; G04B3/00; G04B3/04; G04B3/041
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A crown assembly for use in a watch, comprising a metallic crown which has a blind bore and a peripheral, undercut recess of the bore; a stem having an end portion in the bore; and annular lip means extending outwardly from said end portion into the recess for coupling the crown to the stem.
Claim 2
Dependent Claim
54 words
A crown assembly for use in a watch, comprising a metallic crown which has a blind bore and a peripheral, undercut recess of the bore; a stem having an end portion in the bore; and annular lip means extending outwardly from said end portion into the recess for coupling the crown to the stem.
Claim 3
Dependent Claim
20 words
A crown assembly according to claim 1, wherein said lip means is integral with said end portion of the stem.
Claim 4
Dependent Claim
25 words
A crown assembly according to claim 1, wherein said recess extends from the bore into said crown between inner and outer ends of the bore.
Claim 5
Dependent Claim
44 words
A crown assembly according to claim 3, wherein said stem has a collar secured to an end portion thereof and outwardly extending therefrom in said bore, and said lip means comprises a ring surrounding said stem, engaging said collar, and extending into the recess.
Claim 6
Dependent Claim
14 words
A crown assembly according to claim 4, wherein said ring is a split ring.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |