US3544666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a heat insulating refractory using calcined geyserite having a high tridymite content
Assignee: AGC Inc
•
Filing: 1968-01-04
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Granted: 1970-12-01
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Expires: 1988-01-04
Abstract
No abstract record available.
Inventors
- 👤 Masatoshi Shiota
- 👤 Taizo Kato
- 👤 Hideji Numata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:02
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA30579A
Cited
US2066365A
Cited
US2338060A
Cited
GB697474A
Cited
US2720462A
Cited
GB825792A
Cited
US3314758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |