US3147053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing vacuum tubes
Assignee: RCA Corp
•
Filing: 1960-05-19
•
Granted: 1964-09-01
•
Expires: 1980-05-19
Abstract
No abstract record available.
Inventors
- 👤 George N Phelps
- 👤 Avram M Meshulam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:28
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF EVACUATING AND SEALING AN ENVELOPE HAVING A HOLE THEREIN AND USING A PLUG WHICH MATCHES SAID HOLE, COMPRISING THE STEPS OF APPLYING FRIT TO SAID PLUG, HEATING SAID PLUG AND FRIT TO AN ELEVATED TEMPERATURE TO COAT SAID PLUG WITH A SEALING FILM, PLACING SAID ENVELOPE AND SAID PLUG IN AN EVACUABLE CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID PLUG AND AT LEAST THE PORTION OF SAID ENVELOPE SURROUNDING SAID HOLE TO A LOWER TEMPERATURE THAN SAID ELEVATED TEMPERATURE TO SOFTEN THE GLASS AROUND SAID HOLE AND SAID FRIT COATING, AND PUSHING SAID PLUG INTO SAID HOLE TO SEAL SAID HOLE.
Claim 2
Independent Claim
103 words
THE METHOD OF EVACUATING AND SEALING AN ENVELOPE HAVING A HOLE THEREIN AND USING A PLUG WHICH MATCHES SAID HOLE, COMPRISING THE STEPS OF APPLYING FRIT TO SAID PLUG, HEATING SAID PLUG AND FRIT TO AN ELEVATED TEMPERATURE TO COAT SAID PLUG WITH A SEALING FILM, PLACING SAID ENVELOPE AND SAID PLUG IN AN EVACUABLE CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID PLUG AND AT LEAST THE PORTION OF SAID ENVELOPE SURROUNDING SAID HOLE TO A LOWER TEMPERATURE THAN SAID ELEVATED TEMPERATURE TO SOFTEN THE GLASS AROUND SAID HOLE AND SAID FRIT COATING, AND PUSHING SAID PLUG INTO SAID HOLE TO SEAL SAID HOLE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |