US1298929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing isoprene.
Assignee: ALIEN PROPERTY CUSTODIAN
•
Filing: 1912-02-05
•
Granted: 1919-04-01
•
Expires: 1932-02-05
Abstract
No abstract record available.
Inventors
- 👤 Otto Graul
- 👤 Gottfried Hanschke
- 👤 Franz Webel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/26; C07C1/30; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/935
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1922-03-31 | 1922-09-30 | 1923-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-03-31 | 1926-09-30 | 1927-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-03-31 | 1930-09-30 | 1931-04-01 | $7700.00 | Window Closed / Lapsed |