US3342560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for pulling semiconductor crystals
Assignee: Siemens and Halske AG
•
Filing: 1964-10-22
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Granted: 1967-09-19
•
Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Eckardt Dietrich
- 👤 Mentzel Friedrich Adolf
- 👤 Reinke Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/20; C30B15/22; C30B15/28; C30B15/02; C30B15/10; G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/135; G05D11/138; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1008; Y10T117/1024; Y10T117/1032; Y10T117/1052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
APPARATUS FOR PULLING SEMICONDUCTOR CRYSTALS, COMPRISING CRYSTAL PULLING MEANS DEFINING A VERTICAL AXIS, TWO UPWARDLY OPEN CUP-SHAPED VESSELS OF DIFFERENT VOLUMETRIC SIZES RESPECTIVELY FORCONTAINING DIFFERENT AMOUNTS OF MOLTEN SEMICONDUCTOR MATERIAL, SAID TWO VESSELS BEING MOUNTED COAXIALLY BENEATH SAID PULLING MEANS AND SAID SMALLER VESSEL BEING LOCATED INSIDE SAID LARGER VESSEL, SAID LARGER VESSEL BEING STATIONARY AND SAID SMALLER VESSEL BEING ROTATABLE, ROTATIONAL DRIVE MEANS CONNECTED TO SAID SMALLER VESSEL FOR MAINTAINING IT IN ROTATION DURING CRYSTAL PULLING OPERATION, SAID LARGER VESSEL HAVING A BOTTOM RECESS OF SMALLER DIAMETER THAN IN THE UPPER PORTION OF SAID VESSEL, SAID RECESS HAVINGA DEPTH APPROXIMATELY EQUAL TO THE HEIGHT OF SAID SMALLER VESSEL AND A DIAMETER ADAPTED WITH CLEARANCE TO THE DIAMETER OF SAID SMALLER VESSEL SO AS TO PERMIT SAID SMALLER VESSEL TO BE LOWERED INTO SAID RECESS.
Claim 2
Dependent Claim
135 words
APPARATUS FOR PULLING SEMICONDUCTOR CRYSTALS, COMPRISING CRYSTAL PULLING MEANS DEFINING A VERTICAL AXIS, TWO UPWARDLY OPEN CUP-SHAPED VESSELS OF DIFFERENT VOLUMETRIC SIZES RESPECTIVELY FORCONTAINING DIFFERENT AMOUNTS OF MOLTEN SEMICONDUCTOR MATERIAL, SAID TWO VESSELS BEING MOUNTED COAXIALLY BENEATH SAID PULLING MEANS AND SAID SMALLER VESSEL BEING LOCATED INSIDE SAID LARGER VESSEL, SAID LARGER VESSEL BEING STATIONARY AND SAID SMALLER VESSEL BEING ROTATABLE, ROTATIONAL DRIVE MEANS CONNECTED TO SAID SMALLER VESSEL FOR MAINTAINING IT IN ROTATION DURING CRYSTAL PULLING OPERATION, SAID LARGER VESSEL HAVING A BOTTOM RECESS OF SMALLER DIAMETER THAN IN THE UPPER PORTION OF SAID VESSEL, SAID RECESS HAVINGA DEPTH APPROXIMATELY EQUAL TO THE HEIGHT OF SAID SMALLER VESSEL AND A DIAMETER ADAPTED WITH CLEARANCE TO THE DIAMETER OF SAID SMALLER VESSEL SO AS TO PERMIT SAID SMALLER VESSEL TO BE LOWERED INTO SAID RECESS.
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |