US4167350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing instrument
Assignee: AT Cross Co
•
Filing: 1977-05-11
•
Granted: 1979-09-11
•
Expires: 1997-05-11
Abstract
Abstract A writing instrument in which a marking element is removably mounted in a casing and held in the casing by resilient means acting lengthwise of the writing instrument. A removable plug at one end of the casing holds the removable marking element under compression in the casing.
Inventors
- 👤 Robert L. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:35
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/02; B43K8/03; B43K7/00; B43K7/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
A writing instrument having a casing, a marking element, the forward end of the casing having a conical point with a bore therethrough for passage of the marking element, a cylindrical sleeve secured in the casing and having a free end protruding from the casing, said free end being provided with a bayonet pin receiving slot, a cylindrical plug provided with a radially protruding pin for insertion into the bayonet slot, a compression spring in the plug acting on the marking element in a longitudinal direction to snugly hold the marking element in the sleeve against an abutment surface, said radially protruding pin extending across said plug confining said spring in said plug.
Claim 2
Dependent Claim
113 words
A writing instrument having a casing, a marking element, the forward end of the casing having a conical point with a bore therethrough for passage of the marking element, a cylindrical sleeve secured in the casing and having a free end protruding from the casing, said free end being provided with a bayonet pin receiving slot, a cylindrical plug provided with a radially protruding pin for insertion into the bayonet slot, a compression spring in the plug acting on the marking element in a longitudinal direction to snugly hold the marking element in the sleeve against an abutment surface, said radially protruding pin extending across said plug confining said spring in said plug.
Claim 3
Dependent Claim
30 words
A writing instrument as in claim 1 wherein said spring in the plug includes a slotted presser member straddling said radially protruding pin in said plug and sliding relative thereto.
References Cited (Backward Citations)
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Cited
US1355026A
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US2369224A
Cited
US2428960A
Cited
US2500979A
Cited
US3205863A
Cited
US3972630A
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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) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |