US3845659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microtome having electro-mechanical knife controlling means
Assignee: Reichert Jung Optische Werke AG
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Filing: 1972-06-16
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Granted: 1974-11-05
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Expires: 1992-06-16
Abstract
Abstract An apparatus for cutting microtome specimen sections employs electro-mechanical transducer means connected to the specimen holder, or the knife, to generate an electrical signal during the cutting which indicates the uniformity, or any variations in the uniformity of the thickness of the section.
Inventors
- 👤 P Wikefeldt
- 👤 E Rautio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:16
CPC Classifications
B; B23; B23Q; B23Q17/00; B23Q17/09; B23Q17/0952; B23Q17/0971; B23Q17/0976; G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01L; G01L1/00; G01L1/16; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
In a microtome means of the type comprising two assemblies, and means for moving one of said assemblies with respect to the other of said two assemblies, one of said assemblies including support means for a specimen to be sectioned, the other of the assemblies including support means for a knife for sectioning said specimen, one of said support means including two piezoelectric crystals, one of the crystals being mounted to absorb compressive force during said relative movement, the other of said crystals being mounted to absorb tractive force during said relative movement, electrical current integrating means and circuit means connecting said piezoelectric crystals with said integrating means in electrical opposition to each other, said integrating means generating a signal indicating the total charge generated by said crystals resulting from said relative movement while sectioning a specimen.
Claim 2
Dependent Claim
137 words
In a microtome means of the type comprising two assemblies, and means for moving one of said assemblies with respect to the other of said two assemblies, one of said assemblies including support means for a specimen to be sectioned, the other of the assemblies including support means for a knife for sectioning said specimen, one of said support means including two piezoelectric crystals, one of the crystals being mounted to absorb compressive force during said relative movement, the other of said crystals being mounted to absorb tractive force during said relative movement, electrical current integrating means and circuit means connecting said piezoelectric crystals with said integrating means in electrical opposition to each other, said integrating means generating a signal indicating the total charge generated by said crystals resulting from said relative movement while sectioning a specimen.
Claim 3
Dependent Claim
23 words
The invention defined in claim 1, wherein said support means including said piezoelectric crystals includes a specimen arm for supporting a specimen block.
Claim 4
Dependent Claim
21 words
The invention defined in claim 1, wherein said electrical current integrating means comprises amplifier means having a high negative internal amplification.
Claim 5
Dependent Claim
24 words
The invention defined in claim 3, wherein said electrical current integrating means also includes capacitor means connected between the input of said amplifier means.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |