Patent US2589447A successfully refreshed from Google Patents.
US2589447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of silalactones and of disiloxane dibasic acids
Assignee: Dow Silicones Corp
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Filing: 1950-04-13
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Granted: 1952-03-18
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Expires: 1970-04-13
Abstract
No abstract record available.
Inventors
- 👤 Sommer Leo Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:13
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
THE METHOD OF SELECTIVELY CLEAVING A PHENYL RACIDAL FORM A COMPOUND OF THE GENERAL FORMULA
Claim 2
Independent Claim
15 words
THE METHOD OF SELECTIVELY CLEAVING A PHENYL RACIDAL FORM A COMPOUND OF THE GENERAL FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |