US2929922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masers and maser communications system
Assignee: AT&T Inc
•
Filing: 1958-07-30
•
Granted: 1960-03-22
•
Expires: 1978-07-30
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Schawlow
- 👤 Charles H Townes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 15:58
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/0007; H01S3/10; H01S3/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2836722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |