US3218358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus-containing heterocycles and methods for preparing same
Assignee: Wyeth Holdings LLC
•
Filing: 1961-12-22
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Granted: 1965-11-16
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Welcher Richard Parke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:33
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6568; C07F9/65683; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2608; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/387; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A 4-PHOSPHORINANE OF THE FORMULA
Claim 2
Dependent Claim
5 words
A 4-PHOSPHORINANE OF THE FORMULA
References Cited (Backward Citations)
US2160915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |