US2903474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of spiro heterocyclic phosphorus-containing compounds
Assignee: Union Carbide Corp
•
Filing: 1954-07-29
•
Granted: 1959-09-08
•
Expires: 1974-07-29
Abstract
No abstract record available.
Inventors
- 👤 William M Lanham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657109; C07F9/657127; C07F9/6574; C07F9/65744
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
AS NEW COMPOUNDS, SPIRO HETEROCYCLIC PHOSPHORUSCONTAINING HALIDES HAVING STRUCTURES CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
13 words
AS NEW COMPOUNDS, SPIRO HETEROCYCLIC PHOSPHORUSCONTAINING HALIDES HAVING STRUCTURES CORRESPONDING TO THE FORMULA:
Claim 3
Dependent Claim
10 words
PROCESS FOR PREPARING SPIRO HETEROCYCLIC PHOSPHORUS-CONTAINING HALIDES HAVING THE STRUCTURE:
Claim 4
Dependent Claim
10 words
PROCESS FOR PREPARING SPIRO HETEROCYCLIC PHOSPHORUS-CONTAINING HALIDES HAVING THE STRUCTURE:
References Cited (Backward Citations)
US2661365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |