Patent US2535987A successfully refreshed from Google Patents.
US2535987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aminomethyl compounds of the polycyclic diketo series and n-phthaloyl derivatives thereof
Assignee: GAF Chemicals Corp
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Filing: 1948-11-16
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Granted: 1950-12-26
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Expires: 1968-11-16
Abstract
No abstract record available.
Inventors
- 👤 David I Randall
- 👤 Saul R Buc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:03
CPC Classifications
C; C09; C09B; C09B3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A POLYCYCLIC DIKETO COMPOUND SELECTED FROM THE CLASS CONSISTING OF DIBENZO-PYRENEQUINONE, ANTHANTHRONE, MESO-BENZO-DIANTHRONE, MESONAPHTHO-DIANTHRONE, MESO-ANTHRO-DIANTHRONE, PYRANTHRONE, ISOPRYRANTHRONE, DIBENZO-PYRANTHRONE, VIOLANTHRONE AND ISOVIOLANTHRONE, SAID COMPOUND CONTAINING A MEMBER SELECTED FROM THE CLASS CONSISTING OF PHTHALIMIDOMETHYL, AMINOMETHYL, AND O-CARBOXYBENZOYLAMINOMETHYL GROUPS AS THE ONLY NUCLEAR SUBSTITUENT.
Claim 2
Dependent Claim
42 words
A POLYCYCLIC DIKETO COMPOUND SELECTED FROM THE CLASS CONSISTING OF DIBENZO-PYRENEQUINONE, ANTHANTHRONE, MESO-BENZO-DIANTHRONE, MESONAPHTHO-DIANTHRONE, MESO-ANTHRO-DIANTHRONE, PYRANTHRONE, ISOPRYRANTHRONE, DIBENZO-PYRANTHRONE, VIOLANTHRONE AND ISOVIOLANTHRONE, SAID COMPOUND CONTAINING A MEMBER SELECTED FROM THE CLASS CONSISTING OF PHTHALIMIDOMETHYL, AMINOMETHYL, AND O-CARBOXYBENZOYLAMINOMETHYL GROUPS AS THE ONLY NUCLEAR SUBSTITUENT.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |