US1437138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-pressure regulator
Assignee: Corning Glass Works
•
Filing: 1918-11-19
•
Granted: 1922-11-28
•
Expires: 1938-11-19
Abstract
No abstract record available.
Inventors
- 👤 David E Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:39
CPC Classifications
C; C03; C03B; C03B9/00; C03B9/30; C03B9/36; C03B9/3627; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4643
Claims Analysis
Total Claims: 0
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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) | 1925-11-27 | 1926-05-29 | 1926-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-11-27 | 1930-05-29 | 1930-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-11-27 | 1934-05-29 | 1934-11-28 | $7700.00 | Window Closed / Lapsed |