Patent US4684186A successfully refreshed from Google Patents.
Patent US3746456A successfully refreshed from Google Patents.
US3746456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball point pen writing ball composed of a cemented carbide composition
Assignee: Parker Pen Co
•
Filing: 1971-10-07
•
Granted: 1973-07-17
•
Expires: 1991-10-07
Abstract
Abstract Cemented carbide compositions and shaped bodies produced therefrom containing tungsten carbide or titanium carbide and a binder alloy containing cobalt and nickel, and, by weight, about 18 to 20 percent chromium, 0.1 to 1 percent platinum and 0 to 3 percent iron.
Inventors
- 👤 F Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:00
CPC Classifications
B; B43; B43K; B43K1/00; B43K1/08; B43K1/082; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/067; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The pen of claim 1 wherein the binder alloy contains, by weight, about 30 to 60 cobalt and 20 to 50 percent nickel.
Claim 2
Dependent Claim
24 words
The pen of claim 1 wherein the binder alloy contains, by weight, about 45 to 55 percent cobalt and 25 to 35 percent nickel.
Claim 3
Dependent Claim
70 words
A cemented carbide writing ball for a ball point pen, comprising from about 75 to 95 percent by weight of a carbide selected from the group consisting of tungsten carbide and titanium carbide and from about 5 to 25 percent by weight of a binder alloy containing cobalt and nickel and, by weight, about 18 to 20 percent chromium, 0.1 to 1 percent platinum and 0 to 3 percent iron.
Claim 4
Dependent Claim
25 words
The writing ball of claim 4 wherein the binder alloy contains, by weight, about 30 to 60 percent cobalt and 20 to 50 percent nickel.
Claim 5
Dependent Claim
25 words
The writing ball of claim 4 wherein the binder alloy contains, by weight, about 45 to 55 percent cobalt and 25 to 35 percent nickel.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |