US3492973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube heater
Assignee: Linde GmbH
•
Filing: 1969-04-11
•
Granted: 1970-02-03
•
Expires: 1989-04-11
Abstract
No abstract record available.
Inventors
- 👤 Irwin G Benkert
- 👤 Maurice R Kitzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:20
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; F; F17; F17C; F17C9/00; F17C9/02; F17C2203/00; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2205/00; F17C2205/01; F17C2205/0153; F17C2205/018; F17C2227/00; F17C2227/03; F17C2227/0302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3062197A
Cited
US3361118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |