Patent US3770942A successfully refreshed from Google Patents.
Patent EP0167860A2 successfully refreshed from Google Patents.
US742990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bunsen burner.
Assignee: Individual
•
Filing: 1903-01-10
•
Granted: 1903-11-03
•
Expires: 1923-01-10
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:55
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/44; Y; Y10; Y10S; Y10S137/00; Y10S137/903; Y10S251/00; Y10S251/903
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) | 1906-11-02 | 1907-05-04 | 1907-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-11-02 | 1911-05-04 | 1911-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-11-02 | 1915-05-04 | 1915-11-03 | $7700.00 | Window Closed / Lapsed |