US2905570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting material against the effects of light
Assignee: United States Steel Corp
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Filing: 1957-12-04
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Granted: 1959-09-22
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Expires: 1977-12-04
Abstract
No abstract record available.
Inventors
- 👤 John O Hawthorne
- 👤 Myron H Wilt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A METHOD OF PROTECTING ADDITION POLYMERS AGAINST THE DETERIORATING EFFECTS OF LIGHT WHICH CONSISTS IN INCORPORATING IN THE POLYMER ABOUT 1% OF 9-OXA-9,10-DIHYDROPHENANTHRENE-10-ONE.
Claim 2
Independent Claim
23 words
A METHOD OF PROTECTING ADDITION POLYMERS AGAINST THE DETERIORATING EFFECTS OF LIGHT WHICH CONSISTS IN INCORPORATING IN THE POLYMER ABOUT 1% OF 9-OXA-9,10-DIHYDROPHENANTHRENE-10-ONE.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |