US3669740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning polyamide producing apparatus
Assignee: Teijin Ltd
•
Filing: 1969-10-24
•
Granted: 1972-06-13
•
Expires: 1989-10-24
Abstract
Abstract A METHOD OF CLEANING POLYAMIDE PRODUCING APPARATUS IS DISCLOSED, NAMELY, CONTACTING THE COATING ON THE APPARATUS, AT A TEMPERATURE ABOVE 200*C., WITH A COMPOSITION COMPRISING AT LEAST 25 WEIGHT PERCENT OF ONE OR MORE ORGANIC CARBOXYLIC ACIDS HAVING A BOILING POINT ABOVE 220*C.
Inventors
- 👤 Akira Yamamoto
- 👤 Keiichi Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:35
CPC Classifications
C; C08; C08G; C08G85/00; C08G85/008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |