Patent US3843375A successfully refreshed from Google Patents.
US3843375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic compositions and process of making same
Assignee: Unifrax I LLC
•
Filing: 1973-10-15
•
Granted: 1974-10-22
•
Expires: 1993-10-15
Abstract
Abstract 1. A COMPOSITION OF MATTER MADE BY HOT PRESSING AT A TEMPERATURE IN THE RANGE FROM ABOUT 1800* C. TO ABOUT 2250* C. AND AT A PRESSURE OF AT LEAST ABOUT 70 KG./CM.3, AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF, BY WEIGHT, ABOUT 48% TAN, 32% ZRB2 AND 20% OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF ZRN AND WC.
Inventors
- 👤 Y Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58007; C04B35/622; C04B35/64; C04B35/645; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/932; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A COMPOSITION OF MATTER MADE BY HOT PRESSING AT A TEMPERATURE IN THE RANGE FROM ABOUT 1800* C. TO ABOUT 2250* C. AND AT A PRESSURE OF AT LEAST ABOUT 70 KG./CM.3, AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF, BY WEIGHT, ABOUT 48% TAN, 32% ZRB2 AND 20% OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF ZRN AND WC.
Claim 2
Dependent Claim
59 words
A COMPOSITION OF MATTER MADE BY HOT PRESSING AT A TEMPERATURE IN THE RANGE FROM ABOUT 1800* C. TO ABOUT 2250* C. AND AT A PRESSURE OF AT LEAST ABOUT 70 KG./CM.3, AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF, BY WEIGHT, ABOUT 48% TAN, 32% ZRB2 AND 20% OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF ZRN AND WC.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |