US3299079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelatable spiro [benzopyran-2, 2'-indoline] derivatives
Assignee: Polaroid Corp
•
Filing: 1966-03-11
•
Granted: 1967-01-17
•
Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 Lloyd D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:04
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/44; G; G03; G03C; G03C1/00; G03C1/685
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
A PHOTOSPIRAN, CHELATABLE IN THE OPEN FORM, OF THE FORMULA
Claim 2
Dependent Claim
10 words
A PHOTOSPIRAN, CHELATABLE IN THE OPEN FORM, OF THE FORMULA
Claim 3
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 4
Dependent Claim
5 words
A COMPOUND OF THE 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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |