Patent US4167350A successfully refreshed from Google Patents.
US4167350A
Expired / Lapsed
US
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Writing instrument
Assignee: AT Cross Co
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Filing: 1977-05-11
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Granted: 1979-09-11
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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 12:36
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)
US365747A
Cited
US1355026A
Cited
US2369224A
Cited
US2428960A
Cited
US2500979A
Cited
US3205863A
Cited
US3972630A
Cited
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 |