Patent US2876244A successfully refreshed from Google Patents.
US2876244A
Expired / Lapsed
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Production of heterocyclic dithiophosphoric esters
Assignee: Union Carbide Corp
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Filing: 1954-12-30
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Granted: 1959-03-03
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Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 William M Lanham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:47
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657109; C07F9/657118; C07F9/06; C07F9/16; C07F9/165; C07F9/1651
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
HETEROCYCLIC PHOSPHORUS-CONTAINING CARBOXYLIC ESTERS HAVING STRUCTURES CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
10 words
HETEROCYCLIC PHOSPHORUS-CONTAINING CARBOXYLIC ESTERS HAVING STRUCTURES CORRESPONDING TO THE FORMULA
Claim 3
Dependent Claim
23 words
PROCESS OF PRODUCING HETEROCYCLIC, 1,3-DIOXA-2THIONO-2-2-PHOSPHACYCLOALKYLTHIUO CARBOXYLIC ESTERS CONTAINING PHOSPHORUS IN THE HETEROCYCLIC RING, WHICH COMPRISES REACTING A HETEROCYCLIC DITHIOPHOSPHORIC ACID OF THE FORMULA
Claim 4
Dependent Claim
23 words
PROCESS OF PRODUCING HETEROCYCLIC, 1,3-DIOXA-2THIONO-2-2-PHOSPHACYCLOALKYLTHIUO CARBOXYLIC ESTERS CONTAINING PHOSPHORUS IN THE HETEROCYCLIC RING, WHICH COMPRISES REACTING A HETEROCYCLIC DITHIOPHOSPHORIC ACID OF THE FORMULA
References Cited (Backward Citations)
US2578652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |