US3881828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pens and nibs therefor
Assignee: Wilkinson Sword Ltd
•
Filing: 1973-07-12
•
Granted: 1975-05-06
•
Expires: 1993-07-12
Abstract
Abstract The invention provides a pen nib of ink-permeable metal foam or ink-permeable plastics foam. The foam material used for the pen nibs should be of open-cell structure with the apertures between the cells constituting the pores of the structure.
Inventors
- 👤 Frederick O Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:18
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/02; B43K8/026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
A pen nib composed of a relatively rigid, ink-permeable metal foam material, said foam material having an open-cell structure, said structure having apertures between the cells, said apertures constituting the pores of the structure.
Claim 2
Dependent Claim
34 words
A pen nib composed of a relatively rigid, ink-permeable metal foam material, said foam material having an open-cell structure, said structure having apertures between the cells, said apertures constituting the pores of the structure.
Claim 3
Dependent Claim
24 words
A pen nib according to claim 1, wherein the foam material has from 30 to 80 percent of its total volume as cell space.
Claim 4
Dependent Claim
35 words
A pen nib according to claim 1, wherein the foam material has a mean pore size of from 10 6 to 10 4 metres with a cell size less than 3 X 10 4 metres.
Claim 5
Dependent Claim
28 words
A pen nib according to claim 3, wherein the thickness of material between the pores of the foam is at least one tenth of said mean pore size.
Claim 6
Dependent Claim
14 words
A pen nib according to claim 1, wherein the foam material is of nickel.
Claim 7
Dependent Claim
16 words
A pen nib according to claim 1, wherein the foam material is of a nickel/chromium alloy.
Claim 8
Dependent Claim
16 words
A pen nib according to claim 1, wherein the foam material is of an iron/chromium alloy.
Claim 9
Dependent Claim
69 words
A pen nib composed of a relatively rigid, ink-permeable metal foam material, said foam material having a structure of open-cells with from 30 to 80 percent of its total volume as cell space and with the size of the cells less than 3 X 10 4 metres, said structure having apertures between the cells, said apertures having a mean pore size of from 10 6 to 10 4 metres.
Claim 10
Dependent Claim
69 words
A pen nib composed of a relatively rigid, ink-permeable metal foam material, said foam material having a structure of open-cells with from 30 to 80 percent of its total volume as cell space and with the size of the cells less than 3 X 10 4 metres, said structure having apertures between the cells, said apertures having a mean pore size of from 10 6 to 10 4 metres.
Claim 11
Dependent Claim
18 words
A pen nib according to claim 8, wherein the cells are elongated in the direction of ink flow.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |