US3170941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen-containing spiranes and siloxanes and their preparation
Assignee: Dow Silicones Corp
•
Filing: 1961-10-12
•
Granted: 1965-02-23
•
Expires: 1981-10-12
Abstract
No abstract record available.
Inventors
- 👤 John L Speier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:45
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
6 words
A SPIRANE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
A SPIRANE OF THE GENERAL FORMULA
Claim 3
Independent Claim
9 words
A METHOD FOR MAKING A SPIRANE OF THE FORMULA
Claim 4
Independent Claim
9 words
A METHOD FOR MAKING A SPIRANE OF THE FORMULA
Claim 5
Independent Claim
22 words
A METHOD FOR MAKING A POLYSILOXANE OF THE UNIT FORMULA (RNHR'')2SIO WHICH COMPRISES HYDROLYZING AND CONDENSING A SPIRANE OF THE GENERAL FORMULA
Claim 6
Independent Claim
22 words
A METHOD FOR MAKING A POLYSILOXANE OF THE UNIT FORMULA (RNHR'')2SIO WHICH COMPRISES HYDROLYZING AND CONDENSING A SPIRANE OF THE GENERAL 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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |