US2518576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanization of isobutylene rubber
Assignee: EIDP Inc
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Filing: 1944-01-21
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Granted: 1950-08-15
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Expires: 1964-01-21
Abstract
No abstract record available.
Inventors
- 👤 Bernard M Sturgis
- 👤 Joseph H Trepagnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:23
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A VULCANIZED ISOBUTYLENE RUBBER, BEING A RUBBERY CO-POLYMER OF A MAJOR AMOUNT OF ISOBUTYLENE WITH A MINOR AMOUNT OF A DIOLEFINE, OBTAINED BY VULCANIZING AN ISOBUTYLENE RUBBER STOCK CONTAINING SULFUR, AN ISOBUTYLENE RUBBER VULCANIZATION ACCELERATOR OF THE CLASS CONSISTING OF DITHIOCARBAMATES, THIURAM SULFIDES AND MERCAPTOBENZOTHIAZOLES, AND FROM 0.075 TO 3 PARTS OF A DINITROSOBENZENE OF THE CLASS CONSISTING OF A META- AND A PARA-DINTROSOBENZENE, BASED ON 100 PARTS OF THE ISOBUTYLENE RUBBER, SAID ISOBUTYLENE RUBBER BEING ONE HAIVNG A RANGE OF UNSATURATION OF FROM 0.1% TO 10% OF THE UNSATURATION OF NATURAL RUBBER.
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) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |