US3484469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1,3,5,7-tetramethyl-1,3,5,7-tetraphenylcyclosiloxane
Assignee: Rhone Poulenc SA
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Filing: 1967-01-05
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Granted: 1969-12-16
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Expires: 1987-01-05
Abstract
No abstract record available.
Inventors
- 👤 Paul Alfred Eugene Guinet
- 👤 Robert Raphael Puthet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:22
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/21
Claims Analysis
Total Claims: 0
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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) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |