US3830892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing a molded article of expanded vermiculite
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1971-12-09
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Granted: 1974-08-20
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Expires: 1991-12-09
Abstract
Abstract A NEW EXPANDED VERMICULITE MOLDED ARTICLE IS PRODUCED BY A PROCESS WHICH COMPRISES SUBJECTING VERMICULITE TO HEATING OR IRRADIATION WITH ELECTROMAGNETIC WAVES IN THE PRESENCE OF UREA OR THIOUREA AND, DURING OR AFTER THIS PROCESS, ALLOWING THE VERMICULITE TO CONTACT WITH AN AQUEOUS SOLUTION OF AMMONIUM OR ALKALI SILICATE.
Inventors
- 👤 T Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:00
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B26/127; Y; Y10; Y10S; Y10S106/00; Y10S106/03
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |