US3814612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass useful for forming a reed switch sealing tube
Assignee: Fujitsu Ltd
•
Filing: 1972-06-06
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Granted: 1974-06-04
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Expires: 1992-06-06
Abstract
Abstract A RED SWITCH SEALING GLASS TUBE HAVING A THERMAL EXPANSION COEFFICIENT SIMILAR TO THAT OF THE REED STRIPS, SUBSTANTIALLY NO DEVITRIFICATION TENDENCY AND AN EXCELLENT INFRARED RAY ABSORPTION IS PROVIDED BY GLASS CONSISTING ESSENTIALLY OF 58 TO 64% OF SIO2, 3 TO 5% OF AL2O3, 11 TO 15% OF BAO, 18 TO 23% OF THE SUM OF K2O AND NA2O AND 2 TO 8% OF FEO BY WEIGHT.
Inventors
- 👤 K Inoue
- 👤 T Hara
- 👤 T Oguma
- 👤 T Kitazawa
- 👤 K Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:42
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/082; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; Y; Y10; Y10S; Y10S65/00; Y10S65/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |