US4882209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass capillary tube and method for its production
Assignee: AGC Inc
•
Filing: 1987-09-01
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Granted: 1989-11-21
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Expires: 2007-09-01
Abstract
Abstract A method for producing a glass capillary tube, which comprises drawing under heating a multiple tube assembly comprising a plurality of glass tubes having different diameters arranged coaxially one in another and simultaneously integrating the assembly by heat fusion.
Inventors
- 👤 Tsutomu Maruyama
- 👤 Hidetoshi Matsumoto
- 👤 Yoshiyuki Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:35
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/36; G02B6/38; G02B6/3807; G02B6/3833; G02B6/3854; C; C03; C03B; C03B23/00; C03B23/04; C03B23/047; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1352; Y10T428/1369
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
A glass capillary tube obtained by drawing under heating a multiple tube assembly comprising a plurality of glass tubes having different diameters arranged coaxially one in another and simultaneously integrating the glass tubes by heat fusion, wherein the ratio of the outer diameter to the inner diameter of the capillary tube is at least about 5, and wherein the outermost glass tube in the multiple tube assembly has a thermal expansion coefficient smaller than the thermal expansion coefficient of the inner glass tube adjacent to the outermost glass tube.
Claim 2
Dependent Claim
89 words
A glass capillary tube obtained by drawing under heating a multiple tube assembly comprising a plurality of glass tubes having different diameters arranged coaxially one in another and simultaneously integrating the glass tubes by heat fusion, wherein the ratio of the outer diameter to the inner diameter of the capillary tube is at least about 5, and wherein the outermost glass tube in the multiple tube assembly has a thermal expansion coefficient smaller than the thermal expansion coefficient of the inner glass tube adjacent to the outermost glass tube.
Claim 3
Dependent Claim
34 words
The glass capillary tube according to claim 1, wherein the difference between the thermal expansion coefficients of the outermost glass tube and the inner adjacent glass tube is not more than 2×10 -6 /°C.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |