US3684993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductance coil form assembly
Assignee: AT&T Inc
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Filing: 1971-02-18
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Granted: 1972-08-15
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Expires: 1991-02-18
Abstract
Abstract The assembly includes a coil form having a coil receiving portion and an internally threaded center hole extending longitudinally therethrough. The internally threaded surface has an axial groove therein extending along its length, and the groove is generally concentric to the threaded surface and has a depth greater than the depth of the thread. A thin flat resilient strip is positioned within the groove. The strip has a width that substantially occupies but is less than the width of the groove and is of a thickness that is less than the distance that the depth of the groove exceeds the depth of the thread.
Inventors
- 👤 Curtis Hazen
- 👤 Gerd Achim Tuchen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/041; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/941
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A variable inductance coil form assembly comprising: a coil form having a coil receiving portion and an internally threaded center hole extending longitudinally therethrough, the internally threaded surface within the coil receiving portion having an axial groove therein extending along its length, the groove having a depth greater than the depth of the thread; and a thin flat resilient strip positioned within the groove, the strip having a width that is less than the width of the groove at the grooves widest point and having a thickness that is less than the distance That the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the coil form.
Claim 2
Dependent Claim
125 words
A variable inductance coil form assembly comprising: a coil form having a coil receiving portion and an internally threaded center hole extending longitudinally therethrough, the internally threaded surface within the coil receiving portion having an axial groove therein extending along its length, the groove having a depth greater than the depth of the thread; and a thin flat resilient strip positioned within the groove, the strip having a width that is less than the width of the groove at the grooves widest point and having a thickness that is less than the distance That the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the coil form.
Claim 3
Dependent Claim
28 words
A variable inductance coil form assembly as in claim 1 wherein the bottom of the groove is generally concentric to the internally threaded surface of the coil form.
Claim 4
Dependent Claim
21 words
A variable inductance coil form assembly as in claim 1 wherein the groove subtends an angle of between 60* and 120*.
Claim 5
Dependent Claim
32 words
A variable inductance coil form assembly as in claim 1 wherein the groove extends along the entire length of the coil form and the strip occupies the entire length of the groove.
Claim 6
Dependent Claim
168 words
A variable inductance coil form assembly comprising: a coil form having a coil receiving portion and an internally threaded center hole extending longitudinally therethrough, the internally threaded surface within the coil receiving portion having an axial groove therein extending along its entire length, the groove having a depth greater than the depth of the thread and subtending an angle of between 60* and 120*, the bottom of the groove being generally concentric to the internally threaded surface of the coil form; and a thin flat resilient strip positioned within the groove, the strip having a width that substantially occupies but is less than the width of the groove at the grooves widest point and being of a length that exceeds the length of the groove, and being of a thickness that is less than the distance that the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the coil form.
Claim 7
Dependent Claim
168 words
A variable inductance coil form assembly comprising: a coil form having a coil receiving portion and an internally threaded center hole extending longitudinally therethrough, the internally threaded surface within the coil receiving portion having an axial groove therein extending along its entire length, the groove having a depth greater than the depth of the thread and subtending an angle of between 60* and 120*, the bottom of the groove being generally concentric to the internally threaded surface of the coil form; and a thin flat resilient strip positioned within the groove, the strip having a width that substantially occupies but is less than the width of the groove at the grooves widest point and being of a length that exceeds the length of the groove, and being of a thickness that is less than the distance that the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the coil form.
Claim 8
Dependent Claim
110 words
In combination; a cylindrical member having an internally threaded center hold extending longitudinally therethrough, the internally threaded surface having an axial groove therein extending along its length, the groove having a depth greater than the depth of the thread; and a thin flat resilient strip positioned within the groove, the strip having a width that is less than the width of the groove at the grooves widest point and having a thickness that is less than the distance that the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the cylindrical member.
Claim 9
Dependent Claim
110 words
In combination; a cylindrical member having an internally threaded center hold extending longitudinally therethrough, the internally threaded surface having an axial groove therein extending along its length, the groove having a depth greater than the depth of the thread; and a thin flat resilient strip positioned within the groove, the strip having a width that is less than the width of the groove at the grooves widest point and having a thickness that is less than the distance that the depth of the groove exceeds the depth of the thread, the strip forming a chord that intersects a continuation of the root of the internal thread of the cylindrical member.
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |