John B. Letts
34Patents
10h-index
19Co-inventors
72Inventor score
Filing activity: Mar 27, 1984 → Feb 3, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6044604A | Composite roofing members having improved dimensional stability and related methods | Fixed Constructions | 97 | Expired |
| US5735092A | Composite roofing members having improved dimensional stability and related methods | Performing Operations; Transporting | 92 | Expired |
| US5891563A | Polyisocyanurate boards with reduced moisture absorbency and lower air permeability and related methods | Emerging Cross-Sectional Technologies | 50 | Expired |
| US6117375A | Roofing members without auxiliary facers and related methods | Performing Operations; Transporting | 43 | Expired |
| US7612120B2 | Insulation boards and methods for their manufacture | Emerging Cross-Sectional Technologies | 24 | Expired |
| US7387753B2 | Method and apparatus to monitor the compressive strength of insulation boards | Physics | 23 | Expired |
| US7972688B2 | High density polyurethane and polyisocyanurate construction boards and composite boards | Emerging Cross-Sectional Technologies | 20 | Active |
| US7838568B2 | Insulation boards and methods for their manufacture | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5950383A | Metal roof sealing system and method | Fixed Constructions | 19 | Expired |
| US8453390B2 | High density polyurethane and polyisocyanurate construction boards and composite boards | Emerging Cross-Sectional Technologies | 12 | Active |
| US10000922B1 | Construction boards with coated inorganic facer | Performing Operations; Transporting | 8 | Active |
| US4739122A | Preparation of ketones | Emerging Cross-Sectional Technologies | 6 | Expired |
| US8142903B2 | Construction boards with improved facers | Emerging Cross-Sectional Technologies | 4 | Active |
| US10870987B1 | Isocyanate-based foam construction boards | Chemistry; Metallurgy | 3 | Active |
| US8106106B2 | Insulation boards and methods for their manufacture | Emerging Cross-Sectional Technologies | 2 | Active |
| US4490559A | Process for making aldehydes from diesters of carbonic acid | Chemistry; Metallurgy | 2 | Expired |
| US11174364B2 | Process for producing isocyanate-based foam construction boards | Chemistry; Metallurgy | 2 | Active |
| US7205374B2 | Two-part polyurethane adhesive for bonding insulation boards to a roof deck | Emerging Cross-Sectional Technologies | 1 | Expired |
| US7987730B2 | Method and apparatus to monitor the compressive strength of insulation boards | Physics | 1 | Active |
| US10611066B2 | Process for encapsulating fragile insulation materials within polyisocyanurate | Emerging Cross-Sectional Technologies | 1 | Active |
| US9856651B2 | Fastening plate assembly | Fixed Constructions | 1 | Active |
| US8153039B2 | Method for producing and monitoring the compressive strength of foam insulation board | Physics | 1 | Active |
| US11618235B2 | Encapsulated fragile insulation materials | Emerging Cross-Sectional Technologies | 0 | Active |
| US12358190B1 | Process to yield foam construction boards with low surface irregularities | Chemistry; Metallurgy | 0 | Active |
| US12006414B2 | Process for producing isocyanate-based foam construction boards | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.