US4071364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of photoetching a metal comb
Assignee: Individual
•
Filing: 1975-10-30
•
Granted: 1978-01-31
•
Expires: 1995-10-30
Abstract
Abstract A musical movement which comprises, primarily, a metal comb produced by a chemical machining process and, secondarily, a drum in the shape of a frustum of a stepped comb. The comb is advantageously provided with means whereby it can be fastened to a movement base without employing bolts or the like and the drum steps advantageously have projections, for co-operation with the comb teeth, that do not extend further radially than do the immediately neighboring drum steps of larger size.
Inventors
- 👤 William Frederick Clark
- 👤 Philip Noel Baxendale
- 👤 Michael Noel Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:37
CPC Classifications
G; G10; G10F; G10F1/00; G10F1/06; G03; G03F; G03F7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A process for producing a metal comb for use in a musical movement, wherein the process comprises the steps of preparing duplicate photographic negatives of the desired shape of the comb, covering both sides of a sheet of the metal from which the comb is to be formed by a resist, positioning said photographic negatives in accurate alignment with one another and in masking relationship with the resistcovered opposite sides of said sheet, hardening those parts of the resist that are in register with substantially transparent regions of said negatives, removing the negatives, removing the unhardened parts of the resist, chemically etching the areas of the metal sheet that are not protected by the remaining hardened parts of the resist to form individual teeth of the comb which are tonally accurate and require no subsequent mechanical tuning operation, and removing the hardened resist from both sides of the metal comb.
Claim 2
Dependent Claim
150 words
A process for producing a metal comb for use in a musical movement, wherein the process comprises the steps of preparing duplicate photographic negatives of the desired shape of the comb, covering both sides of a sheet of the metal from which the comb is to be formed by a resist, positioning said photographic negatives in accurate alignment with one another and in masking relationship with the resistcovered opposite sides of said sheet, hardening those parts of the resist that are in register with substantially transparent regions of said negatives, removing the negatives, removing the unhardened parts of the resist, chemically etching the areas of the metal sheet that are not protected by the remaining hardened parts of the resist to form individual teeth of the comb which are tonally accurate and require no subsequent mechanical tuning operation, and removing the hardened resist from both sides of the metal comb.
Claim 3
Dependent Claim
38 words
A process according to claim 1, wherein the step of hardening those parts of the resist that are in register with substantially transparent regions of said negatives is effected by exposing them to a source of ultraviolet light.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the step of removing the unhardened parts of the resist is effected by washing.
Claim 5
Dependent Claim
43 words
A process according to claim 1, wherein the step of removing the parts of the metal sheet that are not protected by the remaining hardened parts of the resist is effected by immersion in an acid which will attack the exposed metal chemically.
Claim 6
Dependent Claim
27 words
A process according to claim 1, wherein said duplicate photographic negatives are prepared as parts of at least one sheet that comprises a plurality of such negatives.
References Cited (Backward Citations)
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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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |