Patent US2729642A successfully refreshed from Google Patents.
US2729642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble salts of 8-(para-aminobenzyl) caffeine and method for their preparation
Assignee: Chattanooga Medicine Co
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Filing: 1954-08-13
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Granted: 1956-01-03
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Expires: 1974-08-13
Abstract
No abstract record available.
Inventors
- 👤 Burgison Raymond Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:18
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/08; A; A61; A61K; A61K31/00; C07D473/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A WATER SOLUBLE, NON-TOXIC ACID SALT OF 8-(PARAAMINOBENZYL) CAFFEINE.
Claim 2
Dependent Claim
9 words
A WATER SOLUBLE, NON-TOXIC ACID SALT OF 8-(PARAAMINOBENZYL) CAFFEINE.
Claim 3
Independent Claim
82 words
THE METHOD OF MAKING A WATER SOLUBLE SALT OF 8(PARA-AMINOBENZYL) CAFFEINE, WHICH COMPRISES REACTING 8-(PARA-AMINOBENZYL) THEOPHYLLINE WITH ACETIC ANHYDRIDE, SALTING OUT THE RESULTING 8-(PARA-ACETYLAMINOBENZYL) THEOPHYLLINE, RECOVERING THE LATTER COMPOUND AND SUSPENDING THE SAME IN WATER, REACTING SAID SUSPENDED LATTER COMPOUND WITH DI-METHYL SULFATE IN THE PRESENCE OF AN ALKALI TO EFFECT THE FORMATION AND PRECIPITATION OF 8-(PARA-ACETYLAMINOBENZYL) CAFFEINE, DEACETYLATING SAID LAST MENTIONED COMPOUND TO FORM THE CORRESPONDING 8-(PARA-AMINOBENZYL) CAFFEINE AND REACTING THE SAME WITH AN ACID TO FORM A SOLUBLE SALT THEREOF.
Claim 4
Independent Claim
82 words
THE METHOD OF MAKING A WATER SOLUBLE SALT OF 8(PARA-AMINOBENZYL) CAFFEINE, WHICH COMPRISES REACTING 8-(PARA-AMINOBENZYL) THEOPHYLLINE WITH ACETIC ANHYDRIDE, SALTING OUT THE RESULTING 8-(PARA-ACETYLAMINOBENZYL) THEOPHYLLINE, RECOVERING THE LATTER COMPOUND AND SUSPENDING THE SAME IN WATER, REACTING SAID SUSPENDED LATTER COMPOUND WITH DI-METHYL SULFATE IN THE PRESENCE OF AN ALKALI TO EFFECT THE FORMATION AND PRECIPITATION OF 8-(PARA-ACETYLAMINOBENZYL) CAFFEINE, DEACETYLATING SAID LAST MENTIONED COMPOUND TO FORM THE CORRESPONDING 8-(PARA-AMINOBENZYL) CAFFEINE AND REACTING THE SAME WITH AN ACID TO FORM A SOLUBLE SALT THEREOF.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |