US3540859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal chalcogenides and intermediates for their preparation
Assignee: ROY DONALD W
•
Filing: 1966-09-09
•
Granted: 1970-11-17
•
Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 Robert C Taylor
- 👤 John B Conn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:19
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/007; C09; C09K; C09K11/00; C09K11/08; C09K11/88; C09K11/881; C09K11/883; C01P; C01P2002/00; C01P2002/70; C01P2002/76; C01P2002/77
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |