US2706194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of phosphonic acids
Assignee: Shell Development Co
•
Filing: 1951-05-14
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Granted: 1955-04-12
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 Forrest J Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:06
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/572; C07F9/576; C07F9/59; C07F9/645; C07F9/6509; C07F9/650952; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2608; C10L1/2616; C10M2223/00; C10M2223/06; C10M2223/065; C10N; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
AS A NEW COMPOUND, AN ESTER OF A PHOSPHONIC ACID, WHICH ESTER CONFORMS IN STRUCTURE TO THE FORMULA:
Claim 2
Dependent Claim
18 words
AS A NEW COMPOUND, AN ESTER OF A PHOSPHONIC ACID, WHICH ESTER CONFORMS IN STRUCTURE TO THE FORMULA:
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) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |