Patent US3792523A successfully refreshed from Google Patents.
US3792523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a cutter foil for dry shaving apparatus
Assignee: US Philips Corp
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Filing: 1972-11-13
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Granted: 1974-02-19
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Expires: 1992-11-13
Abstract
Abstract A process of making a cutter foil for dry shaving apparatus, using a rubber cushion, and a die having raised parts each of which decreases in cross section from a base to a free end, and consists of two superimposed portions between which is a steplike offset, the end portion having a height at least equal to the thickness of the foil; the process comprising a single operation of pressing the die and the cushion together with the foil between them, which causes the end portion of each raised part to punch a hole in the foil, as a first step, and directly thereafter causes the base portion to turn over the edge of the hole, as a second step; followed by removing part only of the turned-over material by grinding in a plane parallel to the surface of the foil.
Inventors
- 👤 S Grunberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:44
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49995
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A process of making a cutter foil for dry shaving apparatus, using a rubber cushion, and a die having raised parts each of which decreases in cross section from a base to a free end, and consists of two superimposed portions between which is a steplike offset, the end portion having a height at least equal to the thickness of the foil; the process comprising a single operation of pressing the die and the cushion together with the foil between them, which causes the end portion of eAch raised part to punch a hole in the foil, as a first step, and directly thereafter causes the base portion to turn over the edge of the hole, as a second step; followed by removing only part of the turned-over material by grinding in a plane parallel to the surface of the foil.
Claim 2
Dependent Claim
141 words
A process of making a cutter foil for dry shaving apparatus, using a rubber cushion, and a die having raised parts each of which decreases in cross section from a base to a free end, and consists of two superimposed portions between which is a steplike offset, the end portion having a height at least equal to the thickness of the foil; the process comprising a single operation of pressing the die and the cushion together with the foil between them, which causes the end portion of eAch raised part to punch a hole in the foil, as a first step, and directly thereafter causes the base portion to turn over the edge of the hole, as a second step; followed by removing only part of the turned-over material by grinding in a plane parallel to the surface of the foil.
Claim 3
Dependent Claim
46 words
A process according to claim 1, using a die in which the height of each base portion, less the thickness of the foil, is smaller than half the difference between the clear widths, measured at the free ends and at the bases, between adjacent raised parts.
Claim 4
Dependent Claim
56 words
A process according to claim 1, using a die in which the clear width measured between the bases of adjacent raised parts is larger than half the clear width between the free ends of the same parts, but is smaller than the whole clear width between the same free ends less the thickness of the foil.
References Cited (Backward Citations)
US1481000A
Cited
US2133445A
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US2248786A
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US2308998A
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US2366487A
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AT228605B
Cited
US3130609A
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |