Patent US4196818A successfully refreshed from Google Patents.
US4192467A
Expired / Lapsed
US
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Document shredder
Assignee: Individual
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Filing: 1978-08-16
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Granted: 1980-03-11
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Expires: 1998-08-16
Abstract
Abstract A document shredder which comprises a strip cutter to cut waste document into strips, a chip cutter to cut the strips into chips, and a minuting device disposed downstream of the chip cutters to cut the chips into pulp-like mass. The minuting device includes a housing having a conical surface formed with cutting teeth, and a conical rotary body formed with cutting teeth in engagement the cutting teeth of the housing.
Inventors
- 👤 Takefumi Hatanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:45
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/30; B30B9/3089; B02; B02C; B02C18/00; B02C18/0007; B02C2018/0023; B02C2018/0038; B02C2018/0046; B02C2018/0061
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A document shredder for processing waste documents, comprising: means for destroying the waste documents such that the documents are rendered unintelligible; drive means for providing driving power to said destroying means; a casing housing said destroying means and said drive means; a stand-by chamber formed in said casing to temporarily keep the waste documents in a stand-by condition; feed means for feeding at least one sheet from the waste documents kept in said stand-by chamber to said destroying means; a cover mounted on said casing to close said stand-by chamber; means for sensing the presence of the waste documents kept in said stand-by chamber and producing an output signal in response thereto; and locking means responsive to said output signal for locking said cover to said casing while said waste documents are kept in said stand-by chamber.
Claim 2
Dependent Claim
137 words
A document shredder for processing waste documents, comprising: means for destroying the waste documents such that the documents are rendered unintelligible; drive means for providing driving power to said destroying means; a casing housing said destroying means and said drive means; a stand-by chamber formed in said casing to temporarily keep the waste documents in a stand-by condition; feed means for feeding at least one sheet from the waste documents kept in said stand-by chamber to said destroying means; a cover mounted on said casing to close said stand-by chamber; means for sensing the presence of the waste documents kept in said stand-by chamber and producing an output signal in response thereto; and locking means responsive to said output signal for locking said cover to said casing while said waste documents are kept in said stand-by chamber.
Claim 3
Dependent Claim
28 words
A document shredder according to claim 1, in which said feed means is operable in response to said output signal to automatically feed said at least one sheet.
Claim 4
Dependent Claim
20 words
A document shredder according to claim 3, in which said drive means is operable in response to said output signal.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |